Introduction of light snow in 24 solar terms

The twenty-four solar terms introduce Xiaoxue: The second solar term in winter occurs on the Gregorian calendar1October 22nd or 23rd, 165438, that is, when the sun reaches 240.

Light snow is a solar term reflecting precipitation and temperature. 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 will get colder and colder and the precipitation will gradually increase. Snow is the product of cold weather. Therefore, compared with the climatic characteristics of "the climate is not deep and the precipitation is not heavy" in this solar term, 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 in this solar term.

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.

Historical origin

Jing Wei Xiao said: "In the fifteenth day after (beginning of winter), the bucket pointed out that the sea was light snow, the sky and the earth were overcast, the temperature was rain, and the cold was snow. At that time, those who talked less were not cold and the snow was not heavy. " Xiaoxue solar term is a climate concept, which represents the climate characteristics during Xiaoxue solar term. Climatic factors include precipitation, temperature and illumination, among which precipitation is an important factor of climate, and light snow is a solar term reflecting the changing trend of temperature and precipitation.

Meteorology refers to the condensation of water vapor falling from the sky to the ground, such as rain, snow and hail, as "precipitation". Xiaoxue's name indicates that the weather is getting colder and colder and the precipitation is not big, so it is used to compare the climate characteristics during this solar term. The arrival of the light snow solar term means that the weather is getting colder and colder and the precipitation is increasing.