What are the coldest days of the year?

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

The winter solstice is usually June 265438+February 2 1 to 23rd every year, while March 9 and April 9 are about 18 to 27th from winter to the future, that is, from the beginning of 1 month to the end of 1 month every year.

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