Why is the second solar term winter?

Light snow is the twentieth solar term among the twenty-four solar terms and the second solar term in winter. The time is Gregorian calendar1October 22 or 23 165438, that is, when the sun reaches 240 degrees of the yellow meridian. Light snow is a solar term reflecting precipitation and temperature, and it is a solar term with high frequency of cold wave and strong cold air activity. The arrival of the light snow solar term means that the weather is getting colder and colder and the precipitation is gradually increasing.

"Snow" is the product of cold weather, so "light snow" is used to describe the climate characteristics of this solar term "the climate is not deep and the precipitation is not heavy". The "light snow" solar term reflects the changing trend of temperature and precipitation, and does not mean that there is a small amount of snow under this solar term. The solar term "light snow" is not necessarily related to the "light snow" in the weather.

During the light snow solar term, 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, which will bring a wide range of strong winds and cool weather.