Day, evening and night mentioned in the weather forecast; Sunny, cloudy, partly cloudy, cloudy; What are the definitions of light snow, medium snow and heavy snow?

The daytime mentioned in the weather forecast refers to 8: 00 to 20: 00 local standard time, in which 17: 00 to 20: 00 is called evening; Call night after 20 o'clock to 8 o'clock the next day. A clear day means that the amount of clouds in the sky is less than 30% (that is, 30%); Cloudy is the sky condition when there are 4-70% medium-low clouds or 6- 10% high clouds in the sky; Partial cloudy is the sky condition when there are 1-3% medium-low clouds or 4-50% high clouds in the sky; A cloudy day is a weather phenomenon in which the sky is dark and the clouds are densely covered, or even if there are gaps in the clouds, the sky still feels dark (accounting for more than 80% of the total amount of clouds), and occasionally weak sunlight can be seen from the gaps in the clouds.

Light snow: the daily snowfall (melting into water) is less than 2.5 mm. Medium snow: the daily snowfall (melting into water) is 2.6-4.9 mm. Heavy snow: the daily snowfall (melting into water) reaches or exceeds 5.0 mm.