Is the Great Cold the coldest solar term? Seasonal characteristics

You may be interested in: solar terms knowledge: is it cold or severe in winter on the solstice?

Is the Great Cold the co

Is the Great Cold the coldest solar term? Seasonal characteristics

You may be interested in: solar terms knowledge: is it cold or severe in winter on the solstice?

Is the Great Cold the coldest solar term?

The great cold solar term is not the coldest time.

Literally, the severe cold solar term should be the lowest temperature in the whole year, but in fact, the temperature of the severe cold solar term is not the coldest time in the whole year. Although the light around the winter solstice is the most oblique, there is still heat accumulation on the surface since summer, and the heat stored on the surface during the slight cold period is the least, so the weather in the slight cold solar term is the coldest.

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Seasonal characteristics of severe cold

During the severe cold solar term, the atmospheric circulation is relatively stable, and the adjustment period of circulation is about 20 days. When this circulation is adjusted, there will often be a wide range of rain and snow weather and strong winds to cool down. When the west of 80 degrees east longitude is a long wave ridge and East Asia is a coastal trough, under the influence of northwest wind flow control and constantly supplemented cold air, China will have a sustained low temperature. Like slight cold, great cold is also a solar term indicating the degree of cold weather. Modern meteorological observation records show that in some areas of China, severe cold is not as good as slight cold, but in some years and a few coastal areas, the annual minimum temperature will still appear within the severe cold solar terms. Therefore, it is necessary to continue to do a good job in the cold protection of crops, especially to protect livestock from wintering.

In the severe cold season, the average temperature in most parts of southern China is 6℃ to 8℃, which is nearly 65438 0℃ higher than slight cold. The proverb "slight cold and cold, cold into a ball" shows that the great cold solar terms are also the cold period of the year. Slight cold and severe cold are the periods with the least rainfall in a year.

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For some crops, a proper low temperature is necessary in a certain growth period. Wheat and rape with strong winterness need lower temperature through vernalization stage, otherwise they cannot grow and develop normally. Most of southern China is warm in winter all year round. Wheat and rape sown too early often grow too vigorously, bolting in advance, and their cold resistance is greatly weakened, which makes them vulnerable to low temperature frost. It can be seen that selecting crop varieties according to local conditions, sowing and planting in time and taking effective measures to promote and control are important links to win high yield.

Slight cold and severe cold are the periods with the least rainfall in a year. During the cold solar term all the year round, the rainfall in most parts of the south only increased slightly compared with the previous period, with 5 ~10mm in most parts of the south and only1~ 5mm in the mountainous areas of the northwest plateau. During the winter drought in South China, the water consumption is small, and the contradiction between supply and demand of farmland water is generally not prominent. In the case of scarce rain and snow, it is undoubtedly beneficial to the growth of wheat crops to water in different areas according to different farming habits and conditions.