Will it snow during the heavy snow solar term? What is the origin of the heavy snow solar term
"The collection of the seventy-two seasons of the moon" said: so far, the snow is full. Heavy snow means that the weather is colder and the possibility of snowfall is greater than that of light snow. It does not mean that the amount of snowfall must be great. So do you want to know whether it will snow in the heavy snow solar term? Next, let's uncover the secret for you.
Origin of heavy snow
'heavy snow' solar term, usually on December 7 or 8 every year. When the solar yellow longitude reaches 255 degrees, it is one of the 24 solar terms' heavy snow '. Heavy snow, as the name suggests, heavy snow. The ancients said, 'the big one is full of snow at this point'. At this time, the snow often falls in a large and wide range, so it is called heavy snow.
At this time, the lowest temperature in most parts of China dropped to 0 ℃ or below. Heavy snow or even Blizzard often falls in areas where cold and warm air meet in front of strong cold air. It can be seen that the heavy snow solar term indicates the starting time and degree of heavy snow in this period. Like light snow, rain, grain rain and other solar terms, it is a solar term that directly reflects precipitation.
In ancient times, heavy snow was divided into three periods: 'first, the cuckoo does not cry; Second, wait for the tiger to hand over; Three waiting litchi sticks out. " It means that because of the cold weather, the cold trumpet bird no longer chirps; This is the peak period of Yin Qi. The so-called prosperity and decline, Yang Qi has sprouted, and the tiger began to courtship. " Liting 'is a kind of orchid. It feels the sprouting of Yang and draws out new buds.
It is often said that 'auspicious snow heralds a good year'. Snow covers the earth in severe winter, keeping the temperature on the ground and around the crops from falling very low due to the invasion of cold current. Winter crops create a good overwintering environment. When the snow melts, it increases the soil moisture content for the needs of crop growth in spring. The content of nitride in snow water is 5 times that of ordinary rain water, which has a certain effect on fertilizing the field. There is a proverb that "wheat cover three layers this year and sleep on steamed bread next year".
Will it snow during the heavy snow season?
In the season of heavy snow, except for the winter free areas in South and South China and southern Yunnan, most parts of China have entered winter. The average temperature in Northeast and Northwest China has reached below - 10 ℃, and the temperature in the Yellow River Basin and North China has also stabilized below 0 ℃. At this time, there is gradually snow in the Yellow River Basin, and heavy snow is flying further north. However, in the south, especially in Guangzhou and the Pearl River Delta, there are still verdant vegetation, and the feeling of dryness is still obvious, which is very different from the climate in the north. The climate in southern China is mild in winter with little rain and snow. The average temperature is about 2 ℃ to 4 ℃ higher than that in the middle and lower reaches of the Yangtze River, and the rainfall accounts for only about 5% of the whole year. Occasional snowfall, mostly in January and February; The area of snow is hard to see once in three or five years. At this time, the climate in South China is also foggy. Generally, December is the month with the most foggy days. Fog usually appears in the morning when there is no or little cloud at night. Meteorology calls it radiation fog 'ten fog and nine sunny'. The fog mostly dissipates before noon, and the afternoon sun will be particularly warm.
We know that strong cold air can often form large-scale snowfall or local blizzard. There are many benefits of snowfall, especially to alleviate the winter drought, freeze to death farmland diseases and insect pests, and facilitate the development of winter tourism. However, snow and slippery roads can easily lead to civil aviation flight delays, road traffic accidents and lane congestion; The snowstorm closure of mountains and roads in some areas will also pose a threat to the safety of human and livestock in pastoral grassland (called white disaster).