number_of_days_with_surface_snow_thickness_at_or_above_threshold 1 [UUUU] 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_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 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".