Traditional Culture Encyclopedia - Weather inquiry - When does cloudy weather usually turn cloudy?

When does cloudy weather usually turn cloudy?

Cloudy to cloudy, generally refers to a process in which the amount of clouds in the sky gradually increases, because the division between cloudy and cloudy days is based on the fact that the coverage area of low clouds in the sky reaches 80%, so when the amount of clouds gradually increases from less than 80% to more than 80%, it is cloudy to cloudy weather.