number_of_days_with_surface_temperature_below_threshold

new

Created: 3 Jun 2026

Proposer: Lars Bärring

Proposed Date: 2026-04-28

308 #7.

Standard names: Standard names for climate indicators based on thresholds

Change Date: 3 Jun 2026, 12:34 a.m.

number_of_days_with_surface_temperature_below_threshold 1 [UUUU] P07 id: Z0QXDO4I
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".

Change Date: 3 Jun 2026, 12:35 a.m.

number_of_days_with_surface_temperature_below_threshold 1 [UUUU] P07 id: Z0QXDO4I
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".