What time is the cold dew

Cold dew: 2023 Gregorian calendar1October 8, 65438+2 1: 05.

August 24th of the year of Guimao in the lunar calendar. Cold dew is the seventeenth solar term among the twenty-four solar terms and the fifth solar term in autumn. The sun reached longitude 195 degrees. After the cold dew, the height of the sun continued to decrease and the temperature gradually decreased. The temperature of cold dew is much lower than solar terms, and the ground is much colder than solar terms, which is likely to become frozen dew, so it is called cold dew.

In September, dew condenses when it is cold. At this time, the temperature is lower than when it is "white dew", and it is more dew and colder, hence the name "cold dew". Cold dew is a symbol of winter, and it is a transitional period from cool to cold. After the cold dew, the dew increases and the temperature decreases. 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.

At this time, it is already late autumn in the north, with white clouds and red leaves and occasional early frost. In the south, autumn is getting stronger and cicadas are dying. The cold dew solar term begins at the end of the first ten days of 10 and ends at the end of 10.

The direct point of the sun continued to move southward in the southern hemisphere, and the angle of sunlight in the northern hemisphere began to tilt obviously. The solar heat received by the ground is obviously less than that in summer, and the influence of cold air can sometimes extend to South China.

Agricultural activities:

After the cold dew, if there is strong cold air going south, the cold dew wind weather with low temperature and strong wind is easy to appear in the south. Cold dew wind is a chilling injury caused by the invasion of cold air in autumn, which reduces rice production.

It is one of the main meteorological disasters in the growth period of late rice in southern China, which mostly occurs around the cold dew festival in the southern lunar calendar. Therefore, Guangdong, Guangxi and Fujian are called cold dew wind, and the Yangtze River basin is called autumn low temperature. ?

In the cold dew season, wheat should be sown in the north, not late, so as not to reduce production. South China should sow rape and plant broad beans in due course. There will be a disastrous weather in South China-Mianyu, which is characterized by high humidity, more clouds, less sunshine and more cloudy days. After that, the number of foggy days will increase obviously, which will directly affect the progress and quality of Sanqiu. Therefore, it is necessary to use the weather forecast to harvest and sow in sunny days.