Is it partly cloudy on sunny days to describe the weather?

Sunny and partly cloudy is a description of the weather.

In meteorological industry standards, sunny days, partial cloudy days, cloudy days and cloudy days are judged by the percentage of cloud area in the sky: it is sunny when the cloud amount is 0%- 10%; 10%-30% partly cloudy; 30%-70% is cloudy; More than 70% is cloudy.

Visually, when it is sunny or partially cloudy, the blue sky is like washing, and there is no cloud or only a small amount of cumulus in Wan Li; Clouds cover most of the sky on cloudy days, mostly cumulus clouds or layered clouds with a small range, through which sunlight can shine on the ground; On cloudy days, a large range of layered clouds cover the sky, which has a great influence on the light transmittance, and generally the sun is not visible.

The word "occasionally" on a sunny day means occasionally and sometimes. So sunny days are partly cloudy, which means it is sunny most of the time, and sometimes there are a few cumulus clouds.