Slight cold joint time

The solar calendar is 65438+ 10 month, and the slight cold is celebrated from June 5 to 7 every year.

The slight cold season is on February 9th and March 9th, when the East Asian trough is the strongest and most stable, the Mongolian cold high and Aleutian low are also the strongest and most stable, and the ridge scale of the westerly trough reaches the maximum, which matches the strongest westerly wind. Therefore, the cooling process of cold air is frequent in slight cold season, and the influence range of severe cold weather in winter reaches the widest extent.

At this time, not only the north is freezing, but also the south is extremely cold. The slight cold and severe cold in a year, the temperature is minimized. The slight cold temperature in many cities is lower than the severe cold. There is a saying in northern China that "slight cold is better than severe cold, which is common but not rare".

Climate agriculture

During the slight cold season, a spring rain is brewing in the winter wheat area in northern China. There is a farmer's proverb as proof, "A farmer can see three whites when he is slightly cold, and he has plenty of food and clothing." In the slight cold season, frost appears at night, which is called "one white"; Water turns into ice, which is called "two whites"; If it snows, it's called "Three Whites".

The "three whites" in the slight cold solar terms mean that the weather is very cold. Wheat is covered with thick snow, which can play the role of heat preservation and moisture retention and lay the foundation for wheat harvest. This is the truth that "wheat covers three layers in winter and steamed bread sleeps next year".