The first solar term in winter

The first solar term in winter is beginning of winter.

Beginning of winter, the 19th of the 24 solar terms, is also the beginning of winter. Bucket handle points to the northwest, and the longitude of the sun reaches 225. It is also the beginning of the festival between Gregorian calendar165438+1October 7-8 every year. When everything is collected in winter, beginning of winter means that life begins to be closed, everything enters a state of recuperation, and its climate changes from dry autumn to rainy and cold winter.

The commonly used methods of season division mainly include "solar terms method" and "temperature method". Traditionally, China takes "beginning of winter" and "24 solar terms" as the beginning of winter. The winter divided by "solar terms method" means that everything is in a state of recuperation, and the "temperature method" divides beginning of winter into seasons with the daily average temperature falling steadily below 10℃ for five consecutive days. Winter divided by temperature means cold weather.

Meteorological change

In early winter, the sun has reached the longitude of 225 degrees, the sunshine time will continue to be shortened, the height of the sun will continue to decrease at noon, and the amount of solar radiation obtained by the northern hemisphere will be less and less, but there is still some energy in the heat stored on the surface in the second half of this year. Because there is still "accumulated heat" on the surface, it is usually not very cold in early winter, and the real cold is after the winter solstice.

Due to the large span between north and south in China and the great climate difference between north and south, the winter with this climatic significance is obviously late for some parts of China. After winter, the climate changes from dry autumn to rainy and cold winter.

In southern China, sunny, warm and comfortable "Xiaoyangchun" weather often appears from beginning of winter to Xiaoxue. There is a folk saying that "it's sunny in October". As the saying goes, "it's warm in August and warm in September, and it's sunny in October". It is generally not too cold in early winter in the south. With the passage of time, after the winter solstice, the cold air frequently goes south, and the temperature gradually drops.