March 9 is a day of the lunar calendar.

202 1 year starts from the winter solstice in 2020, that is, 65438+February 2 1 in 2020.

The number nine starts from the end of June and the winter solstice of 65438+February in the solar calendar every year, which is a solar term suitable for northern China, especially the middle and lower reaches of the Yellow River.

From the day of winter solstice, you will enter the "number nine", commonly known as "cross nine", and then every nine days as a unit, which is called "nine". After nine "nines", it happens to be 8 1 day, that is, "nine out", and then spring warms bloom.

September 2020 19: 65438+February 21~ 65438+February 29, 2020;

Erjiu: 65438+February 30 ~ 202165438+1October 7, 2020;

Sanjiu: 20211.08 ~ 20211.06;

49: 202 1 1 17 ~202 1 1 25;

May 9th: 202165438+1October 26th ~ 2021February 3rd;

June 9: 2021~ February1+02;

79: 2021February13 ~ 2021February 21;

August 9: February 22, 2021~ March 2, 2021;

99: March 3rd, 2021~ March 1+0 1.

Count nine weather changes.

The coldest period in winter usually occurs after the winter solstice. After beginning of winter, it means that it has entered winter, but it doesn't mean that it has started to get cold. So the heat stored on the surface in the second half of the year still has some energy, so it is not very cold.

There is a folk saying that it is "a spring in October". "Xiaoyangchun in October" refers to the sunny, warm and comfortable "Xiaoyangchun" weather during the winter. So early winter (Meng Dong) is generally not very cold, but with the passage of time, cold air frequently goes south and the temperature gradually drops.