1. beginning of winter is one of the twenty-four solar terms in the lunar calendar, and it is also one of the traditional festivals of the Han nationality. Every year around November 7th, when the sun reaches 225 degrees of the yellow meridian, it becomes beginning of winter. Beginning of winter is the 19th solar term among the 24 solar terms, which indicates the change of seasons, and "Li" is the foundation and 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 the vast territory of our country, the winter period is very different. For the Yellow River Basin, once beginning of winter is over, it is not far from the cold winter.

2. Li, Jian Shi also means that winter begins from now on. Winter means the end, which means that crops should be collected after harvest. China took beginning of winter as the beginning of winter.

3. beginning of winter solar term, high-altitude westerly jet has been fully established in southern Asia. 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 and the meridional circulation will be established, and there will be cold waves and significant cooling.

4. In astronomy, beginning of winter is the beginning of winter. However, in climatology, the climatic average temperature is used as the standard to divide the four seasons. The average temperature is below 1℃ in winter and above 22℃ in summer, ranging from 1? 22℃ is spring and autumn. In the Jianghuai area, the beginning of winter season is only the late autumn season, and the real winter begins in late November or early December, which varies from year to year, but there is little difference.