What is the number of clouds in the sky?

Cloud cover refers to the percentage of clouds covering the sky in the sky, which is usually recorded as a fraction of "total cloud cover/low cloud cover". The total cloud cover includes the cloud cover of all kinds of clouds, which refers to the total cloud cover in the sky during observation. Low cloud cover refers to the cloud cover below 2500 meters (the distance from the bottom of the cloud to the ground).

In China's meteorology, moderate and low cloud cover 4/ 10-7/ 10 or high cloud cover 6/ 10- 10 is called cloudy.

In the weather forecast, cloudy means that there are many clouds in the sky and there is not enough sunshine, but you can still see the sky through the cracks in the clouds. The total cloud cover accounts for 2/ 10-8/ 10 of the sky area.