Today is 24 solar terms of light snow, so do you know what it means? Because of the cold weather, the form of precipitation changes from rain to snow, so you must pay attention to safety when traveling.
Light snow generally refers to the snow that is not heavy; Meteorology refers to the snow that is less than or equal to 2.5mm in 24 hours; in 24 solar terms, it is the 20th solar term, on November 22 or 23; it means that the snow begins to fall, and the snow is small.
The origin of the light snow solar term
'light snow' is a festival reflecting weather phenomena. It's the second half of November and the second half of October in the lunar calendar. The snow is small, and there is no snow on the ground, which is the original meaning of the solar term "light snow". The ancient book "qunfangpu" said: 'the light snow is cold and will snow, the earth is not even cold and snow is not big. That is to say, in the 'light snow' Festival, due to the cold weather, the precipitation form changes from rain to snow, but at this time, because the 'cold is not very' the snow falls less frequently and the amount of snow is not large, so it is called light snow. Therefore, light snow represents the starting time and degree of snowfall. Like the solar terms such as rain and grain rain, light snow directly reflects the solar terms of precipitation.
The meaning of light snow term
With the arrival of winter, the climate is getting colder, not only the dew on the ground has become frost, but also the rain in the sky has become snow. After the snow, the earth is covered with white plain clothes. But because the weather is not too cold at this time, the snow below is often in a semi ice and semi melting state, or it melts immediately after falling to the ground, which is called "wet snow" in meteorology; sometimes it rains and snows together, which is called "sleet"; sometimes it drops white ice particles as big as rice grains, which is called "rice snow". Light snow and solar term precipitation are still rare, far from meeting the needs of winter wheat. The morning fog is a little more than the last solar term.
Light snow indicates the start time and extent of snowfall. Snow is the product of cold weather. Light snow solar term, the northern part of the southern region began to enter winter. "The lotus has no cover for the rain, and the chrysanthemum remains with frost branches", showing the scene of early winter. Because there are Qinling Mountains and Dabashan barriers in the north, which block the cold air invasion and weaken the cold wave, the 'warm in winter' in South China is significant. The number of snowfall days in the whole year is less than 5 days, much less than that in the middle and lower reaches of the Yangtze River at the same latitude. There was little chance of snowfall before the heavy snow. Because the temperature near the surface of South China in winter is often kept above 0 ℃, snow is not easy than snowfall. However, in the cold Northwest Plateau, it usually begins to snow in October. The number of snowfall days in the northwest of the plateau can reach more than 60 days in the whole year, and some alpine areas have the possibility of snowfall in the whole year.