Heavy snow is the second1solar term among the 24 solar terms and the third solar term in winter. When the sun reaches 255 degrees of the Yellow Meridian, the node time is 6-8 February in Gregorian calendar/kloc-0 every year. The heavy snow solar term is the beginning of the second month of the dry branch calendar, marking the official start of the mid-winter season. Heavy snow is a solar term that reflects the 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 cold water vapor, representing cold and precipitation. The solar term of heavy snow is a climate concept, which represents the climate characteristics during the solar term of heavy snow, that is, temperature and precipitation (the water vapor condensate such as rain, snow and hail falling from the sky to the ground is called "precipitation" in meteorology). Like the light snow solar term, the heavy snow solar term is a solar term reflecting the changing trend of temperature and precipitation, and it is a reflection of ancient farming culture for festivals.

Meteorological changes:

"Heavy snow" is a solar term reflecting the climate characteristics. The characteristics of heavy snow solar term are that the temperature drops significantly and the precipitation increases compared with autumn and early winter. During the heavy snow season, most parts of China have entered the cold winter, and the lowest temperature in some northern areas has dropped to 0℃ or below. In areas where cold and warm air meet at the front of strong cold air, precipitation (rain or snow) increases. Meteorologically, rain, snow, hail and other water vapor condensate falling from the sky to the ground are called "precipitation".