Traditional Culture Encyclopedia - Weather inquiry - In the weather forecast, what are the criteria for dividing sunny days, partial cloudy days, cloudy days and cloudy days?

In the weather forecast, what are the criteria for dividing sunny days, partial cloudy days, cloudy days and cloudy days?

Sunny (or partly cloudy): Wan Li has no clouds, the sky is blue, or there are only a few clouds, and the cloud amount is less than 30%.

Cloudy: refers to the fact that clouds cover most of the sky, and the total amount of clouds is above 30% and below 70%. Sunlight can reach the ground through the clouds.

Cloudy day: Clouds are almost all over the sky, and the total amount of clouds is above 70%.