What does light snow mean in solar terms?

Light snow solar term Light snow is the twentieth solar term among the twenty-four solar terms and the second solar term in winter.

I. Historical origin

"The Book of Filial Piety" says: "On the 15th day after (beginning of winter), the bucket pointed to the sea, and it was a light snow. The sky and the earth are overcast, the temperature is rainy, and the cold is snowy. 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. Climate factors include precipitation, temperature and light, among which precipitation is an important factor of climate. Meteorology, rain, snow, hail and other water vapor condensation falling from the sky to the ground are called "precipitation".

Second, meteorological changes.

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. There is no necessary connection between the light snow in solar terms and the light snow in the weather. The meaning of "light snow" in solar terms is different from that in daily weather forecast. Light snow solar term is a climate concept, which reflects the temperature and precipitation. The light snow in the weather forecast refers to the snow with less snowfall intensity. Snow is the product of cold weather.

Third, phenology.

The ancients in China divided the light snow into three stages: the stage when the rainbow disappeared; Second, the weather is rising and the atmosphere is falling; Third, the weather was blocked and turned into winter. The yang in the sky rises and the yin in the ground falls, which leads to the impassability between heaven and earth and the disharmony between yin and yang, so everything loses its vitality, and the heaven and earth are blocked and become a cold winter.