Introduction to the characteristics of cold dew solar terms

1, cooling faster and drier. The sudden drop in temperature is a feature of the cold dew solar terms. It is common for the temperature to drop by 8℃ and 10℃ after the autumn rain brought by a strong cold air. However, most stormy weather does not last long (except West China). Controlled by cold and high pressure, it is warm during the day, cool at night and crisp in autumn during the day. The weather has also become drier. It is understood that cold dew is a festival in late autumn, and the word "cold" first appeared in the twenty-four solar terms. At this time, the geese fly south and the chrysanthemums turn yellow. Compared with the "white dew" a month ago, the temperature is lower, the dew is more, and it is chilly.

2. The average temperature distribution is quite different. From June 5th to 10, the regional difference of the average temperature distribution in China is obvious. The average temperature in most parts of South China is above 22℃, and it is even higher in Hainan, which is above 25℃, and it has not yet come out of summer. Jianghuai and Jiangnan are generally between 15℃ and 20℃, and the southeast, North China and Huanghuai are between 8- 16℃. At this time, the average temperature in parts of the northwest and north-central northeast has reached below 8℃. The average temperature in some plateau areas of Qinghai Province is even lower than 0℃.

3. Cold air frequently goes south. According to climatology, after the cold dew, the cold air in the north has a certain influence, and most parts of China are controlled by cold high pressure, and the rainy season is over. The weather is usually warm during the day and cool at night, with clear skies in Wan Li and a scene of late autumn. In normal years, at this time, the isotherm of 10℃ has moved southward to the Qinling Mountains and Huaihe River, and generally falls below 0℃ to the north of the Great Wall. The first frost can be seen in most years in Beijing, the capital. After entering the "cold dew", the invasion frequency and intensity of cold air in the north will increase, and the rapid temperature drop is a major feature of the "cold dew" solar term. It is common for the temperature to drop by 8℃ to 10℃ after the autumn rain brought by a strong cold air.

4. Rainfall is scarce, and thunderstorms almost disappear. 65438+10.8 is the "cold dew" in the 24 solar terms, which means the turning point from cold to cold in a year. With the arrival of cold dew, most parts of China will turn cold, and the northeast and northwest regions have entered or will soon enter winter, with less rain. In addition to the perennial snow on the Qinghai-Tibet Plateau, it has generally begun to snow in the northeast and northern Xinjiang. Thunderstorms have disappeared in most parts of Chinese mainland, and thunder can be heard only in parts of Yunnan, Sichuan and Guizhou. The precipitation in June 5438+ 10 in North China is generally only half or less than that in September, while in Northwest China it is only a few millimeters to more than 20 millimeters. Drought and lack of rain often bring difficulties to timely sowing of winter wheat and become one of the main limiting factors for high yield of dry land wheat.