What is the origin of the solar term "light snow"?

Xiaoxue is the twentieth solar term among the twenty-four solar terms and the second solar term in winter. It falls on165438+1October 22nd or165438+1October 23rd in the Gregorian calendar every year, that is, when the sun reaches the longitude of 240 degrees. Light snow is a solar term reflecting precipitation and temperature. It is a solar term with high cold wave frequency and strong cold air. The arrival of light snow means that the weather will get colder and colder and the precipitation will gradually increase. [9]

This solar term is called light snow because "snow" is the product of cold weather. During this solar term, the climate is not deep and the precipitation is not great, so "light snow" is used to compare the climate characteristics during this solar term. "Light snow" is a metaphor, which reflects the active cold current and increased precipitation in this solar term, rather than the light snow under this solar term. [ 10- 1 1]

In the light snow season, a relatively stable meridional circulation has been established in East Asia, and low pressure or trough often appears in Siberia. When moving eastward, there will be a wide range of cold air going south, and there will be a wide range of windy and cool weather in the southeast.