When is the deep winter?

Deep winter is a mild and severe cold.

Slight cold is the 23rd of the 24 solar terms, and it is also a solar term of the twelfth lunar month. It is the same as great cold, slight summer heat, great summer heat and summer heat, and it is a solar term indicating temperature change.

The Great Cold is the last of the 24 solar terms. Fighting refers to ugliness; The solar meridian reaches 300; Celebrate on the calendar of 65438+1October 20-2 1 every year. Great cold, like slight cold, is also a solar term indicating the cold weather. Great cold refers to extremely cold weather. According to China's long-term meteorological records, there is no slight cold in the great cold solar terms in the northern region; But for most parts of the south, the coldest is the great cold solar term.

Great cold solar terms:

The coldest time of the year is the slight cold and great cold solar terms after the winter solstice solar terms, especially the great cold solar terms; This is because after the solar term of winter solstice, the direct sunlight point will gradually move northward, but for a period of time, the direct sunlight point will always be in the southern hemisphere, and the heat in the northern hemisphere will always be lost, and the heat absorbed during the day is still less than the heat released at night.

Therefore, after the winter solstice, the temperature in the northern hemisphere continues to decrease, and the temperature drops to the lowest during the great cold solar term, which is the coldest solar term in a year. Because China has a vast territory and a large span between the north and the south, the climate between the north and the south is quite different.

According to China's long-term meteorological records, there is no slight cold in the great cold solar terms in the northern region; But for most parts of the south, April and September are the coldest, so the big cold solar terms are colder than the small ones. Slight cold and severe cold are the periods with the least rainfall in a year. During the annual cold solar term, the rainfall in South China is only 5 to 10 mm. ..

Refer to the above? Baidu encyclopedia-slight cold

Refer to the above? Baidu encyclopedia-great cold