# Does solar radiation stimulate formation of clouds?

Observing the sky for multiple months during winter and spring I noticed that on cloudy days sunset correlates with clearer sky than at daytime. And backwards, several tens of minutes after sunrise clouds appear seemingly out of nowhere. This made me wonder: does solar radiation somehow stimulate formation of clouds — and is this really a known effect, or just my somehow biased impression?

I live at $60^\circ\mathrm N\,30^\circ\mathrm E$ if this matters.

• Weather can be highly regional and depend on a variety of local factors. Can you give us more information about the location? – macco May 29 '17 at 11:54
• @macco $60^\circ \mathrm N\,30^\circ \mathrm E$. – Ruslan May 29 '17 at 12:15