晴, qíng, clear, nice weather.
Originally, the character on the left was not the sun, but the moon, and the part on the right represented growing grass – see the picture on the left below. The sun later took the place of the moon. 青 has the meaning of blue. It is used to evoke a blue sky.
The sense of clear, bright, clear weather has thus imposed itself.
晴 = 日+ 青, sun + blue
晴 is in female first names. For example, a mother named her daughter 雨晴 (rain and shine). It rained before the birth, shortly after the sun showed up. Great story!
Articles on characters by radical:
11 August 2020