When was the Great Cold in 2023?

The severe cold in 2023 is 65438+10/6: 00 in Gregorian calendar in 20231February 29.

The Great Cold is the last of the 24 solar terms. There is a saying that the Great Cold welcomes the New Year. The longitude of the sun reaches 300, and festivals are held every year from June 20th to February1year1October 20th in Gregorian calendar 65438. Great cold, like slight cold, is also a solar term indicating the cold weather. Great cold refers to extremely cold weather. The severe cold solar term is between March 9 and April 9. At this time, the cold wave frequently goes south, which is the coldest season of the year with strong wind and low temperature.

According to China's long-term meteorological records, there is no slight cold in the great cold solar terms in the north, but it is the coldest among the great cold solar terms in most parts of the south. In ancient China, severe cold was divided into three stages: first, chicken milk, second, poultry was seriously ill, and third, water moistened the abdomen. In the third stage, the temperature of the great cold is extremely low, and the ice in the water can freeze to the center of the water, and it is thick and firm. The great cold comes at the end of the year, winter goes to spring, and after the great cold, a new cycle begins.

Cold weather changes;

During the severe cold solar term, the atmospheric circulation is relatively stable, and the adjustment period of circulation is about 20 days. When this circulation is adjusted, there will often be a wide range of rain and snow weather and strong winds to cool down. When the west of 80 degrees east longitude is a long wave ridge and East Asia is a coastal trough, under the influence of the northwest wind and the constantly supplemented cold air, China will have a sustained low temperature.

For some crops, proper low temperature is necessary in a certain growth period. Wheat and rape with strong winterness need lower temperature to pass vernalization stage, otherwise they cannot grow normally. Most of southern China is warm in winter all year round. Wheat and rape sown too early often grow too vigorously, bolting in advance, and their cold resistance is greatly weakened, which makes them vulnerable to low temperature frost.