What is beginning of winter?

1, beginning of winter is one of the 24 solar terms of the lunar calendar and one of the traditional festivals of the Han nationality. Every year, around165438+1October 7th, when the sun reaches 225 degrees of the longitude, it starts in beginning of winter. Beginning of winter is the19th solar term among the 24 solar terms, indicating the change of seasons, and "beginning of winter" is the foundation and the beginning. "Winter" is the end. It means that all the crops in autumn have been harvested and put into storage, and winter has begun. But in fact, due to China's vast territory, the winter period is very different. For the Yellow River Basin, once beginning of winter is over, the cold winter is not far away.

2, Li, also, shows that winter has started from now on. Winter means the end, which means that the crops should be harvested after harvest. China regards beginning of winter as the beginning of winter.

3. Since the beginning of the beginning of winter solar term, the westerly jet in South Asia has been fully established. At this time, the fluctuation of the south branch of the high-altitude westerly wind and its eastward movement have great influence on the precipitation weather in Jianghuai area. When the zonal circulation in Asia and the fluctuation of the south branch of the westerly wind are strong, there will be a wide range of rainy weather. In addition, the zonal circulation will end, the meridional circulation will be established, and there will be a cold wave and significant cooling.

In astronomy, beginning of winter is the beginning of winter. But in climatology, the average temperature of climate is used as the standard to divide the four seasons. The average temperature below 10℃ is winter and above 22℃ is summer, with the range of 10? 22℃ is spring and autumn. In Jianghuai area, the beginning of winter season is only the late autumn season, and the real winter begins in late 165438+ 10 or early February of 65438, which varies from year to year, but there is little difference.