Why are the solar terms with the lowest temperature in a year slight cold and severe cold?

The solar terms with the lowest temperature in a year are slight cold and severe cold, and entering slight cold marks the beginning of the coldest day of the year. There is a folk proverb that cold is mild and cold is ice.

In most parts of China, slight cold is the lowest solar term in a year, and only a few years have the temperature of great cold lower than slight cold. ?

What do you mean by slight cold and severe cold?

Slight cold is the 23rd solar term among the 24 solar terms in the lunar calendar and the fifth solar term in winter, which marks the official start of the winter season. The sun is located at 285 degrees of the yellow meridian. For China, a slight cold marks the beginning of the coldest day of the year. According to China's meteorological data, slight cold is the lowest temperature solar term, and the temperature of great cold is lower than slight cold in only a few years.

The Great Cold is the last of the 24 solar terms. Every year around 65438+10.20, when the sun reaches 300, it is a severe cold. At this time, the cold wave frequently goes south, which is the coldest period of the year in most parts of China. The wind is strong, the temperature is low, and the snow on the ground does not melt, showing a cold scene of ice and snow. During this period, railway, post and telecommunications, petroleum, shipping and other departments should pay special attention to take measures to prevent severe weather such as strong winds and blizzards as soon as possible. Agriculture should strengthen the cold and antifreeze of livestock and wintering crops.