What is the light snow solar term?

Light snow solar term: it is the 20th solar term among the 24 solar terms and the 2nd solar term in winter, and the time is on the 22nd or 23rd of the Gregorian calendar1October every year, that is, when the sun reaches 240 degrees of the yellow meridian.

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 is getting colder and colder and the precipitation is gradually increasing.

Light snow is a concept of climate, and its climatic elements include precipitation, temperature and illumination. Because "snow" is the product of cold weather, the climate is not deep and the precipitation is not great during this solar term, so "light snow" is used to describe the climate characteristics during this solar term, which 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 related to the weather.

Meteorological change

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. Light snow solar terms indicate that a relatively stable meridional circulation has been established in East Asia. When the Siberian depression or trough moves eastward, there will be a wide range of cold air going south, which will bring a wide range of windy and cool weather.

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, while light snow in weather forecast refers to snow with less snowfall intensity. Meteorologically, when it snows, the horizontal visual distance is equal to or greater than 1 1,000m, the ground snow depth is less than 3cm, and the snowfall in 24 hours is zero.

Light snow solar terms do not necessarily snow. In fact, the solar terms with the largest snowfall in the whole year are not in light snow and heavy snow. For example, the solar term with the largest annual snowfall in the middle and lower reaches of the Yellow River and its vicinity is neither "light snow and heavy snow" nor "slight cold and severe cold", but a "rainy" solar term in spring.