Heavy Snow is the twenty-first solar term among the twenty-four solar terms and the third solar term in winter.

Dou Zhi Ren, the sun reaches 255 degrees of ecliptic longitude, and the festival time is December 6-8 of the Gregorian calendar every year. The Snow solar term is the beginning of the Zi month in the Ganzhi calendar, marking the official start of the midwinter season.

Heavy snow is a solar term that reflects climate characteristics. The characteristics of heavy snow solar term are a significant drop in temperature and an increase in precipitation. "Snow" is the product of water vapor encountering cold, which represents cold and precipitation.

Historical origin:

The twenty-four solar terms are the product of farming civilization. The climatic factors that affect agricultural production are mainly precipitation, temperature and light. The heavy snow solar term, like the light snow solar term, is a reflection of The seasonal changes in temperature and precipitation are the reflection of the farming culture on the solar terms.

Heavy snow is a solar term that reflects climate characteristics. Climate elements include precipitation, temperature, light, etc., among which precipitation is an important element of climate. Meteorologically speaking, water vapor condensation such as rain, snow, and hail that falls from the sky to the ground is called "precipitation." The arrival of heavy snow in the solar term means that the weather is getting colder and the precipitation is increasing.