What does the cold dew solar term mean? What are the characteristics of cold dew?

1, cold dew, is the seventeenth of the twenty-four solar terms and belongs to the fifth solar term in autumn. Finger e; Longitude of solar arrival195; Gregorian calendar1October 7 -9 10 every year. Cold dew is a solar term reflecting the characteristics of climate change. After the cold dew solar terms, the days become shorter, the nights become longer, the sunshine decreases, the hot air slowly recedes, the cold gradually increases, the temperature difference between day and night is larger, and it feels a little chilly in the morning and evening. From the climate characteristics, in the cold dew season, the autumn in the south is getting stronger, cool and cool, with little rain and dryness; The vast areas in the north have entered or will enter winter from late autumn.

2. Cheng's "Twenty-four Solar Terms" says: "In September, the dew is cold and will condense." The meaning in the work is that the temperature of cold dew is lower than that of white dew, and the morning dew on the ground is cold and about to condense. The ancients gradually regarded cold dew as a sign of cold. After the "cold dew" solar term, the hot air subsided, the cold became longer and the weather gradually turned cold. As the saying goes, "White dew does not show, cold dew feet do not show."

3. After the cold dew, 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 temperature to rise above 30℃, while the minimum temperature can drop below 10℃. Due to global warming, the cooling date may be postponed. Except for a few valley lowlands, the five-day average temperature in the northwest plateau is generally lower than 10℃. According to the standard of dividing the four seasons by climatology, it is already winter, and first frost is thousands of miles away, which is quite different from the autumn colors in the south.