Why is the lowest temperature from winter to Sunday the coldest in the great cold?

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. The Great Cold is the last of the 24 solar terms in China. After the great cold, a new year's solar cycle is ushered in.

In winter solstice, the height of the sun in the northern hemisphere is the smallest and the daytime is the shortest, but the temperature in winter solstice is not the lowest. It is because when the direct point of the sun moves to the southern hemisphere, the temperature in the northern hemisphere begins to drop a little, and the cooling in the northern hemisphere is a continuous and slow process. On the solstice of winter, when the sun shines directly on the tropic of Capricorn, the temperature of the earth is still falling. After the winter solstice, the direct point moves northward to a certain extent, and the temperature in the northern hemisphere will rise slowly.