Distribution of cloudy and sunny days from 218 to 222?

the distribution is uneven in different regions. According to the weather forecast, in North China, cloudy days are mostly winter and spring, and sunny days are mostly autumn and summer. In Northeast China, cloudy days are mostly summer and autumn, and sunny days are mostly winter and spring. In East China, cloudy days are mostly spring and winter, and sunny days are mostly summer and autumn. The distribution of cloudy and sunny days will also be affected by climate change and regional characteristics, and the specific situation needs to be analyzed according to the meteorological data of the region.