EnvThes
deprecated concept
LTER EU controlled vocabulary
Sunshine duration or sunshine hours is a climatological indicator, measuring duration of sunshine in given period (usually, a day or a year) for a given location on Earth, typically expressed as an average of several years. [Wikipedia] the period during which direct solar a title=\\"Irradiance\\" href=\\"https://en.wikipedia.org/wiki/Irradiance\\"irradiance/a exceeds a threshold value of 120 W/m².
duration of sunshine