At the start of winter, the sun has reached the longitude of 225 degrees, the duration of sunshine will continue to shorten, and the height of the noon sun will continue to decrease, and the amount of solar radiation obtained by the northern hemisphere will be less and less, but the heat stored by the surface in the second half of the year at this time still has a certain amount of energy. Because the surface still has "accumulated heat", so the early winter is usually not very cold, the real cold after the winter solstice. Due to the large span between the north and the south of China and the wide difference in climate between the north and the south, the winter of this climatic significance is obviously too late for some areas of China. After the start of winter, its climate changes from dry autumn with little rain to rainy winter with cold.

During the Start of Winter, the upper westerly jet is fully established in southern Asia. At this time, the fluctuation strength and eastward shift of the south branch of the upper westerly wind. When there is a zonal circulation in the Asian region and the south branch of the westerly wind fluctuates strongly, there will be a wide range of cloudy and rainy weather. In addition, the zonal circulation will end and the meridional circulation will establish, and there will be cold waves and substantial cooling.

south

In the southern region, from the start of winter to light snow period, often appear sunny, warm and comfortable "Xiaoyangchun" weather, in the folk there is "October Xiaoyangchun" said, is the so-called "August warm September warm, October and Xiaoyangchun". In the early winter in the south, it is generally not very cold. As time goes by, cold air frequently moves south after the winter solstice, and the temperature gradually drops.

In southern China, the start of winter is still a summer and autumn scene. Especially in the Guangdong area of Hainan, where the summer has just left, the early autumn scene has slowly rolled out, and the winter is still some way away from here. Winter doesn‘t begin in these places until December, when the cold slowly sets in. In the southwest of Jiangnan, frost fog appeared at this time, and when you get up and go out in the morning, there will be thick fog and thin frost on the plants. In addition, the southwest region at this time ushered in the rainy season, rainfall is very much.
For ancient people, on the one hand, the start of winter marks the beginning of winter, which is the coldest season, and on the other hand, winter is also a rare time of leisure after three seasons of busy farming. Cooking tea and drinking wine around the stove is not only today‘s enjoyment, as early as the Tang and Song dynasties, the ancients would open a charcoal fire in the start of winter, feasting and gathering music, poetry and singing.