Standard names: Standard names for climate indicators based on thresholds

[larsbarring]

Following on from previous conversations, most recently in #31, we would like to request the following standard names for climate indicators based on thresholds. As detailed below, some of these deprecate existing standard names where the "threshold comparison" did not specify whether it is a strict (>, <) or a non-strict one (>=, <=) in favor of a specifying a strict comparison

Proposer's name: Lars Bärring
(tagging @nCarolina)

Date: 2026-04-28

1: number_of_days_with_air_temperature_above_threshold

• Deprecated by 2: number_of_days_with_air_temperature_strictly_above_threshold

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2: number_of_days_with_air_temperature_strictly_above_threshold

• Units: 1
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold is a count of the number of days on which the condition X_strictly_above_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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3: number_of_days_with_air_temperature_at_or_above_threshold

• Units: 1
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_at_or_above_threshold is a count of the number of days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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4: number_of_days_with_air_temperature_at_or_below_threshold

• Units: 1
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_at_or_below_threshold is a count of the number of days on which the condition X_at_or_below_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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5: number_of_days_with_air_temperature_below_threshold

• Deprecated by 6: number_of_days_with_air_temperature_strictly_below_threshold

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6: number_of_days_with_air_temperature_strictly_below_threshold

• Units: 1
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_below_threshold is a count of the number of days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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7: number_of_days_with_surface_temperature_below_threshold

• Deprecated by 8: number_of_days_with_surface_temperature_strictly_below_threshold

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8: number_of_days_with_surface_temperature_strictly_below_threshold

• Units: 1
• Description: The surface temperature is the temperature at the interface, not the bulk temperature of the medium above or below. The surface called "surface" means the lower boundary of the atmosphere. A variable whose standard name has the form number_of_days_with_X_strictly_below_threshold is a count of the number of days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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9: number_of_days_with_lwe_thickness_of_precipitation_amount_above_threshold

• Deprecated by 10: number_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

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10: number_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

• Units: 1
• Description: The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold is a count of the number of days on which the condition X_strictly_above_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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11: number_of_days_with_lwe_thickness_of_precipitation_amount_at_or_above_threshold

• Units: 1
• Description: The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. A variable whose standard name has the form number_of_days_with_X_at_or_above_threshold is a count of the number of days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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12: number_of_days_with_lwe_thickness_of_precipitation_amount_at_or_below_threshold

• Units: 1
• Description: The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. A variable whose standard name has the form number_of_days_with_X_at_or_below_threshold is a count of the number of days on which the condition X_at_or_below_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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13: number_of_days_with_lwe_thickness_of_precipitation_amount_strictly_below_threshold

• Units: 1
• Description: The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. A variable whose standard name has the form number_of_days_with_X_strictly_below_threshold is a count of the number of days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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14: number_of_days_with_wind_speed_above_threshold

• Deprecated by 15: number_of_days_with_wind_speed_strictly_above_threshold

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15: number_of_days_with_wind_speed_strictly_above_threshold

• Units: 1
• Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold is a count of the number of days on which the condition X_strictly_above_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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16: number_of_days_with_wind_speed_at_or_above_threshold

• Units: 1
• Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_at_or_above_threshold is a count of the number of days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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17: number_of_days_with_wind_speed_at_or_below_threshold

• Units: 1
• Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_at_or_below_threshold is a count of the number of days on which the condition X_at_or_below_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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18: number_of_days_with_wind_speed_strictly_below_threshold

• Units: 1
• Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_strictly_below_threshold is a count of the number of days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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19: number_of_days_with_surface_snow_thickness_at_or_above_threshold

• Units: 1
• Description: Surface snow refers to the snow on the solid ground or on surface ice cover, but excludes, for example, falling snowflakes and snow on plants. "Thickness" means the vertical extent of a layer. Unless indicated in the cell_methods attribute, a quantity is assumed to apply to the whole area of each horizontal grid box. Previously, the qualifier where_type was used to specify that the quantity applies only to the part of the grid box of the named type. Names containing the where_type qualifier are deprecated and newly created data should use the cell_methods attribute to indicate the horizontal area to which the quantity applies. A variable whose standard name has the form number_of_days_with_X_at_or_above_threshold is a count of the number of days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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20: lwe_thickness_of_precipitation_amount_at_or_above_threshold

• Units: m
• Description: The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. A variable whose standard name has the form X_at_or_above_threshold represents the accumulation of X considering only values where X meets or exceeds the threshold (inclusive). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s).

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21: lwe_precipitation_rate_at_or_above_threshold

• Units: m s-1
• Description: "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The abbreviation "lwe" means liquid water equivalent. "Precipitation rate" means the depth or thickness of the layer formed by precipitation per unit time. A variable whose standard name has the form X_at_or_above_threshold represents the mean value of X considering only values where X meets or exceeds the threshold (inclusive). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s).

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22: spell_length_of_days_with_air_temperature_above_threshold

• Deprecated by 23: spell_length_of_days_with_air_temperature_strictly_above_threshold

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23: spell_length_of_days_with_air_temperature_strictly_above_threshold

• Units: day
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_above_threshold is satisfied, where the threshold value itself is excluded (strict inequality). A variable whose standard name has the form spell_length_of_days_with_X_strictly_above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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24: spell_length_of_days_with_air_temperature_at_or_above_threshold

• Units: day
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X_at_or_above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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25: spell_length_of_days_with_air_temperature_at_or_below_threshold

• Units: day
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_at_or_below_threshold is satisfied, where the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X_at_or_below_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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26: spell_length_of_days_with_air_temperature_below_threshold

• Deprecated by 27: spell_length_of_days_with_air_temperature_strictly_below_threshold

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27: spell_length_of_days_with_air_temperature_strictly_below_threshold

• Units: day
• Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). A variable whose standard name has the form spell_length_of_days_with_X_strictly_below_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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28: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_above_threshold

• Deprecated by 29: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

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29: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

• Units: day
• Description: "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_strictly_above_threshold is satisfied, where the threshold value itself is excluded (strict inequality). A variable whose standard name has the form spell_length_of_days_with_X_strictly_above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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30: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_at_or_above_threshold

• Units: day
• Description: "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_at_or_above_threshold is satisfied, where the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X_at_or_above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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31: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_at_or_below_threshold

• Units: day
• Description: "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_at_or_below_threshold is satisfied, where the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X_at_or_below_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed i### 1: number_of_days_with_air_temperature_above_threshold

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32: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_below_threshold

• Deprecated by 33: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_below_threshold

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33: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_below_threshold

• Units: day
• Description: "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_strictly_below_threshold is satisfied, where the threshold value itself is excluded (strict inequality). A variable whose standard name has the form spell_length_of_days_with_X_strictly_below_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

[github-actions]

Thank you for your proposal. These terms will be added to the cfeditor (http://cfeditor.ceda.ac.uk/proposals/1) shortly. Your proposal will then be reviewed and commented on by the community and Standard Names moderator.

[larsbarring]

Alison, @japamment: These standard names (new and changes/deprecations) have not been added to the cfeditor. Would it help if I upload a csv file (it already exists). If so, any guidance regarding format?

It would be really good to have these included in the upcoming version, because we are soon going to to produce operational data using these. Moreover, the general principles underlying the construction of the standard names have been discussed, and agreed in previous issues as noted above.

[japamment]

Hi Lars, @larsbarring

Thank you for these proposals which have now been added to the cf editor and apologies for the delay.

All the names and units look fine.

I have a few suggestions and questions regarding the descriptions. In particular, I have made comments about proposals 1 and 2 that apply equally to many of the names. I have also made some comments about proposals 20 and 21.

I agree that the principles of how to deal with threshold names have already been thoroughly discussed in other issues, so I hope we can resolve the outstanding points quickly and move these names towards acceptance.

Noting here that this issue is related to the discussions in open issues #31, #14 and #19. Progress here will allow us to progress/close some of the others.

Best wishes,
Alison

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1. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5857

Name: number_of_days_with_air_temperature_above_threshold

Units: 1

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_above_threshold" or "at_or_above_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_above" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_below|above_threshold is a count of the number of days on which the condition X_below|above_threshold is satisfied. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

It has already been agreed (#31) to deprecate this name but not turn it into an alias of one of the newer names. This isn't something we have done previously for standard names, but I don't think it poses a problem as long as the status of the name is clear. I have kept the existing description as we do not want to alter the meaning and have prepended it with new text to explain the deprecation. Does this look okay?

I have applied the same approach to all the names proposed for deprecation.

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2. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5860

Name: number_of_days_with_air_temperature_strictly_above_threshold

Units: 1

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

Rather than have separate description text for each of the phrases strictly_above_threshold, strictly_below_threshold, at_or_above_threshold and at_or_below_threshold I have attempted to combine them in a way that can be reused for all the threshold names. This helps to ensure consistency, is easier to maintain, and I hope it is clear enough to be understandable.

I have applied the same approach to all the newly proposed names.

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3. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5833

Name: number_of_days_with_air_temperature_at_or_above_threshold

Units: 1

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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4. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5834

Name: number_of_days_with_air_temperature_at_or_below_threshold

Units: 1

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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5. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5861

Name: number_of_days_with_air_temperature_below_threshold

Units: 1

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_below_threshold" or "at_or_below_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_below" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_below|above_threshold is a count of the number of days on which the condition X_below|above_threshold is satisfied. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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6. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5862

Name: number_of_days_with_air_temperature_strictly_below_threshold

Units: 1

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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7. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5863

Name: number_of_days_with_surface_temperature_below_threshold

Units: 1

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_below_threshold" or "at_or_below_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_below" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. The surface temperature is the temperature at the interface, not the bulk temperature of the medium above or below. The surface called "surface" means the lower boundary of the atmosphere. A variable whose standard name has the form number_of_days_with_X_below|above_threshold is a count of the number of days on which the condition X_below|above_threshold is satisfied. It must have a coordinate variable or scalar coordinate variable with the a standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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8. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5864

Name: number_of_days_with_surface_temperature_strictly_below_threshold

Units: 1

Description: The surface temperature is the temperature at the interface, not the bulk temperature of the medium above or below. The surface called "surface" means the lower boundary of the atmosphere. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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9. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5866

Name: number_of_days_with_lwe_thickness_of_precipitation_amount_above_threshold

Units: 1

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_above_threshold" or "at_or_above_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_above" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. "Amount" means mass per unit area. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form number_of_days_with_X_below|above_threshold is a count of the number of days on which the condition X_below|above_threshold is satisfied. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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10. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5865

Name: number_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

Units: 1

Description: "Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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11. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5838

Name: number_of_days_with_lwe_thickness_of_precipitation_amount_at_or_above_threshold

Units: 1

Description: The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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12. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5839

Name: number_of_days_with_lwe_thickness_of_precipitation_amount_at_or_below_threshold

Units: 1

Description: The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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13. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5840

Name: number_of_days_with_lwe_thickness_of_precipitation_amount_strictly_below_threshold

Units: 1

Description: The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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14. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5867

Name: number_of_days_with_wind_speed_above_threshold

Units: 1

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_above_threshold" or "at_or_above_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_above" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name upward_air_velocity.) The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_below|above_threshold is a count of the number of days on which the condition X_below|above_threshold is satisfied. It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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15. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5868

Name: number_of_days_with_wind_speed_strictly_above_threshold

Units: 1

Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name "upward_air_velocity"). The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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16. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5842

Name: number_of_days_with_wind_speed_at_or_above_threshold

Units: 1

Description: The wind speed is the magnitude of the wind velocity. Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name "upward_air_velocity"). A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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17. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5843

Name: number_of_days_with_wind_speed_at_or_below_threshold

Units: 1

Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name "upward_air_velocity"). The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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18. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5844

Name: number_of_days_with_wind_speed_strictly_below_threshold

Units: 1

Description: Wind is defined as a two-dimensional (horizontal) air velocity vector, with no vertical component. (Vertical motion in the atmosphere has the standard name "upward_air_velocity"). The wind speed is the magnitude of the wind velocity. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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19. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5845

Name: number_of_days_with_surface_snow_thickness_at_or_above_threshold

Units: 1

Description: Surface snow refers to the snow on the solid ground or on surface ice cover, but excludes, for example, falling snowflakes and snow on plants. "Thickness" means the vertical extent of a layer. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

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20. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5846

Name: lwe_thickness_of_precipitation_amount_at_or_above_threshold

Units: m

Description: "Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A variable whose standard name has the form X_at_or_above_threshold represents the accumulation of X considering only values where X meets or exceeds the threshold (inclusive). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s).

This is different from many of the existing threshold names in that it does not record a number of days of occurrence or a spell length. In this variable, X would be lwe_thickness_of_precipitation_amount. We do have that as an existing standard name so it can be used for the threshold variable.

I suggest simplifying "A variable whose standard name has the form X_at_or_above_threshold represents the accumulation of X considering only values where X meets or exceeds the threshold (inclusive)" to "A variable whose standard name has the form X_at_or_above_threshold represents only those values where X meets or exceeds the threshold (inclusive)." I think this reads a little better and could be applied to any X.

For the locations where X does not meet or exceed the threshold, will the data variable have missing values? Do we need to mention that in the description?

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21. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5847

Name: lwe_precipitation_rate_at_or_above_threshold

Units: m s-1

Description: The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. "Precipitation rate" means the depth or thickness of the layer formed by precipitation per unit time. A variable whose standard name has the form X_at_or_above_threshold represents the mean value of X considering only values where X meets or exceeds the threshold (inclusive). It must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s).

We have an existing standard name lwe_precipitation_rate which can be used for the threshold values.

The description says "A variable whose standard name has the form X_at_or_above_threshold represents the mean value of X considering only values where X meets or exceeds the threshold (inclusive)." Is the inclusion of the word "mean" intentional? If X is a mean, should that not be recorded in the cell_methods as "time:mean"? Then the description could be similar to the previous one, "A variable whose standard name has the form X_at_or_above_threshold represents only those values where X meets or exceeds the threshold (inclusive)." Should this name (and proposal 20) both include a sentence in the descriptions along the lines of "A cell_methods attribute must be provided to describe any processing of quantity X before the threshold is applied."?

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22. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5869

Name: spell_length_of_days_with_air_temperature_above_threshold

Units: day

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_above_threshold" or "at_or_above_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_above" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_below|above_threshold is satisfied. A variable whose standard name has the form spell_length_of_days_with_X_below|above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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23. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5870

Name: spell_length_of_days_with_air_temperature_strictly_above_threshold

Units: day

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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24. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5871

Name: spell_length_of_days_with_air_temperature_at_or_above_threshold

Units: day

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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25. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5872

Name: spell_length_of_days_with_air_temperature_at_or_below_threshold

Units: day

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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26. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5873

Name: spell_length_of_days_with_air_temperature_below_threshold

Units: day

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_below_threshold" or "at_or_below_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_below" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_below|above_threshold is satisfied. A variable whose standard name has the form spell_length_of_days_with_X_below|above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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27. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5874

Name: spell_length_of_days_with_air_temperature_strictly_below_threshold

Units: day

Description: Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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28. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5875

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_above_threshold

Units: day

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_above_threshold" or "at_or_above_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_above" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_below|above_threshold is satisfied. A variable whose standard name has the form spell_length_of_days_with_X_below|above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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29. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5876

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_above_threshold

Units: day

Description: "Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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30. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5877

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_at_or_above_threshold

Units: day

Description: "Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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31. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5878

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_at_or_below_threshold

Units: day

Description: Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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32. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5879

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_below_threshold

Units: day

Description: This standard name is deprecated in favor of similar names containing the phrase "strictly_below_threshold" or "at_or_below_threshold" depending on which is most suitable for data being newly created. Use of the more precisely defined names is recommended to avoid ambiguity as to whether the threshold value itself is included when calculating the value of the quantity. For cases where the inclusion of the threshold is unknown, or is unlikely to significantly affect the value of the quantity, it is recommended to use the name containing "strictly_below" which is generally applicable to high-precision (floating point) data. This name has not been made into an alias of the more precisely defined names to avoid unintentionally changing the meaning of existing data. "Amount" means mass per unit area. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. The construction lwe_thickness_of_X_amount or _content means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. A spell is the number of consecutive days on which the condition X_below|above_threshold is satisfied. A variable whose standard name has the form spell_length_of_days_with_X_below|above_threshold must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

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33. Editor entry: https://cfeditor.ceda.ac.uk/proposal/5880

Name: spell_length_of_days_with_lwe_thickness_of_precipitation_amount_strictly_below_threshold

Units: day

Description: "Amount" means mass per unit area. The construction "lwe_thickness_of_"X"_amount" or "_content" means the vertical extent of a layer of liquid water having the same mass per unit area. The abbreviation "lwe" means liquid water equivalent. "Precipitation" in the earth's atmosphere means precipitation of water in all phases. A spell is the number of consecutive days on which the condition X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form spell_length_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_method entry for within days which describes the processing of quantity X before the threshold is applied. A spell_length_of_days is an intensive quantity in time, and the cell_methods entry for over days can be any of the methods listed in Appendix E appropriate for intensive quantities e.g. "maximum", "minimum" or "mean".

[larsbarring]

Alison, @japamment, thank you !! I will look this through carefully and come back soon (this week!)

[larsbarring]

Regarding your first comment, not to alias the standard names (#31), I had forgotten about that. Thanks for including this!
Regarding your second comment to combine the phrases, I fully understand and agree with the need to keep up maintainability and consistency. At the same time the text becomes a bit more complex and difficult to read. Hence I am exploring a couple of alternatives:

Current suggestion

Name: number_of_days_with_air_temperature_strictly_above_threshold

Units: 1

Description current suggestion:
Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied. A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

Update alternative 1

Description updates with edits shown:
Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold |X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied , which means that . A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

Description updated:
Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold is a count of the number of days on which the threshold condition is satisfied, which means that the threshold value itself is excluded (strict inequality). A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

Update alternative 2

Description updates with edits shown:
Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold or | number_of_days_with_X_at_or_above_threshold|X_at_or_below_threshold is a count of the number of days on which the threshold condition is satisfied , which means that . A condition of the form strictly_above|below means the threshold value itself is excluded (strict inequality) either excluded ("strictly"), or included ("at_or"). A condition of the form at_or_above_threshold|at_or_below_threshold means the threshold value itself is included. A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

Description updated*:
Air temperature is the bulk temperature of the air, not the surface (skin) temperature. A variable whose standard name has the form number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold or X_at_or_above_threshold|X_at_or_below_threshold .is a count of the number of days on which the threshold condition is satisfied, which means the threshold value itself
is either excluded ("strictly"), or included ("at_or"). A variable whose standard name has the form number_of_days_with_X relative to a threshold condition must have a coordinate variable or scalar coordinate variable with the standard name of X to supply the threshold(s). It must have a climatological time variable, and a cell_methods entry for within days which describes the processing of quantity X before the threshold is applied. A number_of_days is an extensive quantity in time, and the cell_methods entry for over days should be "sum".

As a variation on the second alternative the phrase
'.... is either excluded ("strictly"), or included ("at_or").'
could be changed to
'... is either excluded or included depending on the phrase "strictly" or "at_or".'
or something similar.

Now looking at these alternatives, I think the most difficult part is the
"number_of_days_with_X_strictly_above_threshold|X_strictly_below_threshold|X_at_or_above_threshold|X_at_or_below_threshold"
Maybe it could be split slightly different to focus more cleanly on the comparison part:
"strictly_above_threshold|strictly_below_threshold|at_or_above_threshold|at_or_below_threshold"
?

Anyway, these are just a couple of thought without any insight into how the phrase bank works or is used in the standard name processing. I will be happy with whichever conclusion you arrive at, including sticking with what you already have suggested.