When is the Great Cold Day?

The festival falls on January 20-21 of the Gregorian calendar every year.

Dahan is the last solar term among the twenty-four solar terms. Dou Zhichou; the sun's yellow longitude reaches 300°; the festival occurs on January 20-21 of the Gregorian calendar every year. Dahan, like Xiaohan, is also a solar term that indicates the degree of cold weather. Dahan means that the weather is extremely cold. The coldest time in the south is the Great Cold Season.

During the Great Cold, the atmospheric circulation is relatively stable, and the circulation adjustment period is about 20 days. When this kind of circulation adjusts, large-scale rain, snow, and windy cooling often occur. When there is a long-wave ridge to the west of 80 degrees east longitude and a large coastal trough in East Asia, China will experience persistent low temperatures due to the control of northwesterly airflow and the continuous replenishment of cold air.