duration_of_sunshine
https://w3id.org/hacid/data/cs/variables/cf/duration_of_sunshine <https://w3id.org/hacid/onto/data/Variable>
The WMO definition of sunshine is that the surface incident radiative flux from the solar beam (i.e. excluding diffuse skylight) exceeds 120 W m-2. "Duration" is the length of time for which a condition holds.
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duration_of_sunshine