The weather after Laba

It may not be cold. Whether it is cold or not depends on the condition of the sun. Every year, 65438+February 22nd is the winter solstice, and the sun shines directly on the Tropic of Capricorn. From this day on, nine days is 19, nine days is 29, and then three nine four nine. ?

Under normal circumstances, it is coldest in March and September in northern China, and it is coldest in April and September in parts of southern China. However, the temperature has increased this winter compared with previous years, and it is generally warmer. During the March 9th period, affected by the cold air from the south, the temperature dropped, which once made people doubt that this year was a "cold winter".

Climatic characteristics:

Beginning of winter said that since then, winter has traditionally started with "beginning of winter" in 24 solar terms.

"beginning of winter" refers to wind and rain, humidity, light, temperature, etc. At the turning point, the climate is gradually changing from autumn to winter. In winter, the direct point of the sun moves south to the tropic of Capricorn, and then turns back to the north.

In early winter, the sun reaches the longitude of 225 degrees, and the earth is at declination-16 19'. The height of the sun in the northern hemisphere becomes smaller, the daylight time becomes shorter, and the amount of solar radiation obtained in the northern hemisphere becomes less and less. However, there is still some energy in the heat stored on the surface in the second half of this year, so it is not very cold.

During the period of Meng Dong (winter solstice and light snow), when there is no wind, there is often sunny, warm and comfortable "Xiaoyangchun" weather, and there is a folk saying of "Xiaoyangchun in October".

It is generally not very cold in early winter (Meng Dong) in some parts of the south, but with the passage of time, cold air frequently goes south and the temperature gradually drops. The northern region is very cold from winter to spring, and the climate change of several solar terms in winter is not obvious. Snow is the main feature of northern winter.

In some areas of southern China, it is always warm as spring during the winter solstice and the Light Snow Festival (equivalent to October of the lunar calendar), so that some fruit trees mistakenly think that spring has come and bloom for the second time. As the saying goes, "it's warm in August and warm in September, and it's sunny in October." In the dead of winter, it is usually not very cold before the so-called "Sanjiu Cold" and "Sanjiu Cold".

Starting from the winter solstice, every nine days counts as a "nine", the first nine days are called "one nine", the last nine days are called "two nine", and so on. The coldest period of the year is "three nine days".

From the beginning of the winter solstice solar term, it began to enter the "three or nine days." Strong cold air frequently goes south, the temperature drops suddenly and the weather is cold. Therefore, the solstice winter is really cold winter.

Baidu Encyclopedia-Winter