What is the origin of solar terms knowledge about cold dew?

The coolness of autumn dissipates, the cold dew season comes, the weather turns from cold to cold, the temperature drops gradually, the cold wind is bleak, and the footsteps of autumn garden in winter are approaching. Remember to add clothes. Then, this issue of the Old Yellow Calendar will show you the origin of cold dew.

About the origin of the cold dew: Gregorian calendar 10 year 10 8 or 9, the sun reaches 195.

"Twenty-four solar terms" said: "In September, the dew is cold and will condense." Cold dew means that the temperature is lower than that of the white dew, and the dew on the ground is colder and will soon condense into frost.

In the cold dew season, Nanling and the vast area to the north have entered autumn, and the northeast and northwest regions have entered or are about to enter winter. In the capital Beijing, you can see the first frost in many years. In addition to the perennial snow on the Qinghai-Tibet Plateau, it has generally begun to snow in the northeast and northern Xinjiang.

In China, the cold dew is divided into three stages: "The first stage is the swan goose; Second, the sparrow enters the water and becomes a clam; Three chrysanthemums have yellow flowers. " In this solar term, geese move south in a line or herringbone queue; In the cold late autumn, all the birds disappeared. The ancients saw a large number of clams suddenly appearing on the seashore. The stripes and colors of shells were very similar to those of birds, and they thought they were birds. The third stage of "Chrysanthemum begins to blossom" means that the chrysanthemum has opened in a large area at this time.

After the cold dew, the dew increases and the temperature decreases. At this time, frost will appear in some parts of China. In the north, it is already a scene of late autumn, with white clouds and red leaves and occasional early frost. In the south, autumn is getting stronger and cicadas are dying. The custom of climbing mountains in Beijing is more prosperous. Jingshan Park, Badachu and Xiangshan are all good places to climb mountains. The Double Ninth Festival will attract many tourists.

In China, cold dew is traditionally regarded as a sign of cold weather. The solar term of the Mid-Autumn White Dew is "dew condenses white", and it is already "dew cold, it will condense into frost" when it is cold in season and autumn.

At this time, the temperature in most parts of South China continued to drop. The average daily temperature in South China is less than 20℃. Even in the areas along the Yangtze River, it is difficult for the mercury column to rise above 30℃, while the minimum temperature can be reduced to below 10℃. Except for a few valley lowlands, the five-day average temperature in the northwest plateau is generally lower than 10℃, which is already winter according to the standard of climatic division of four seasons. Thousands of miles away, first frost and Wan Li are snowing, which is very different from autumn in South China.

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