What do you mean by heavy snow and solar terms?

Heavy snow is not only the 21st solar term in the 24 solar terms of the lunar calendar, but also the third solar term in winter, marking the official beginning of the midwinter season. when the sun reaches 24 degrees of longitude, it means that the weather is colder and the possibility of snowfall is greater than that of Lesser Snow. It doesn't mean that there must be a lot of snowfall. Let's take a look at what heavy snow solar terms mean.

What do you mean by heavy snow and solar terms?

Heavy snow, as its name implies, has a lot of snow. The ancients said: "the big one, Sheng also, and snow Sheng also", to this time, the snow tends to fall heavily, and the range is also wide. At this time, the lowest temperature in most parts of China has dropped to 0 ℃ or below, and there will be heavy snow or even blizzard in the areas where the cold and warm air meet in front of the strong cold air. It can be seen that the heavy snow solar terms indicate that during this period, the starting time and snow volume of heavy snow, like Lesser Snow, Rain Water, Grain Rain and other solar terms, directly reflect the solar terms of precipitation.

Heavy Snow Solar terms and Agricultural production

The season of heavy snow is divided into three phases, the first is not singing, the second is the tiger, and the third is Li, which means that because of the cold weather, the cold birds no longer sing, and this is the period when Yin is at its peak, the so-called extreme decline, Yang has begun to sprout, the tiger began to courtship behavior, "Li Ting" is a kind of bluegrass, feel the germination of Yang and sprout a new bud.

It is often said that "auspicious snow heralds a bumper year". The snow covers the earth in severe winter to keep the temperature on the ground and around the crops from falling very low because of the cold spell, and winter crops create a good environment for overwintering. When the snow melts, it increases the soil water content to meet the needs of crop growth in spring. The content of nitride in snow water is 5 times that of ordinary Rain Water, which can fertilize the field to a certain extent. There is a peasant proverb that "wheat covers three layers of quilt this year and sleeps on steamed bread in the coming year."

Weather characteristics of heavy snow and solar terms

1. Cooling: some people have made statistics that the month with the most strong cold air in China is in November. In most parts of the north, the average temperature in December is about-5km / ℃. After the strong cold air in the south, frost sometimes occurs, and the strong cold air can often form a wide range of snow or local snowstorm.

2. Freezing rain: freezing rain is easy to occur when strong cold air reaches the south, especially in Guizhou, Hunan, Hubei and other places. Freezing rain is a snowflake that falls from the upper cold layer, sometimes melts into rain in the middle layer, and then becomes the supercooling water of raindrops even though the temperature is lower than 0 ℃. The supercooled water droplet falls from the air, and when it reaches the ground and touches anything on the ground, it immediately freezes, forming freezing rain.

3, rime: according to statistics, generally from November to February of the following year, rime will appear successively in the northwest, northeast and most of the Yangtze River basin, and the mountain areas with high humidity are more common. Rime is a milky ice crystal deposit directly condensed by water vapor in the air at low temperature, or directly frozen by supercooled fog droplets.

4. Haze: in December, in the south of the Yangtze River, which is just entering winter, when the temperature is relatively low in the morning, or after rain and snow, the humidity near the ground is high, and there may be foggy areas. The haze weather in the northern city will also take a look at it.

5. Ice flood: in winter, the Baotou reach of Inner Mongolia freezes over the river, while the Lanzhou River in the south does not seal the river, and the river flows to the river that has already been blocked. Because the ice sheet and ice dam on the blocked river block the upstream water, forcing the water level to rise, it is easy to cause the disaster of flooding the river bank in the Baotou reach. If the strong cold air comes late, December will easily lead to the flow of ice disaster.