What's the weather like in winter, mild or severe?

During the winter solstice, the sun shines directly near the tropic of Capricorn, and the daytime in the northern hemisphere is the shortest; After that, the position of direct sunlight moved northward and the days became longer. "After the winter, a needle came out, but it crossed the long line".

At this time, the cold air in the north is powerful, which indicates that winter is coming and the coldest season is coming. The average daily temperature in the middle and lower reaches of the Yangtze River ranges from 2 degrees to 5 degrees, and the snowfall or rainfall10mm to 30mm. ..

During the slight cold, the daily average temperature in the middle and lower reaches of the Yangtze River is 1 to 3 degrees, and it is below zero in Jiangbei. Snowfall or rainfall10mm to 30mm.

Great cold is the coldest season in a year, and then there is "three-point water heating" in beginning of spring.

The daily average temperature in the middle and lower reaches of the Yangtze River is 1 to 3 degrees, and the snowfall or rainfall is10mm to 30mm ... The main farming activities are: storing fertilizer, making fertilizer, repairing water conservancy in winter, planting trees, cleaning and transforming fish ponds, etc.

[Side note]

Luoxiahong (BC 156 ~ 87) was a native of Langzhong, Baxian, which is now Langzhong, Sichuan. Folk astronomers in the western han dynasty. In order to reform the calendar, Emperor Wu of the Han Dynasty recruited astronomers, which was recommended by Qiao Long, a fellow villager who moved from his hometown to the capital Chang 'an. The calendar he created in cooperation with Deng Ping and Tang Dou is superior to other 17 calendars proposed at the same time.