What are the coldest days of the year?

The coldest month of the year is from March 9th to April 9th.

The winter solstice is usually from December 21st to 23rd every year, and the March 9th and April 9th are about 18 to 27 days after the winter solstice, that is, from the beginning of January to the end of January every year.

at this time, the coldest weather is mainly caused by the daily heat budget deficit on the ground. On the winter solstice, the ground in the northern hemisphere receives the smallest direct solar area, and at this time it gets the least solar heat. With the passage of time, the ground temperature continued to drop. By March 9th and April 9th, the deficit of ground heat budget in the northern hemisphere reached the maximum, and with the influence of Siberian cold current, it became the coldest time of the year.