What does the cold dew solar term mean?

Cold dew is the season of late autumn, and the cold dew solar terms mark the transition from cool to cold.

Cold dew, the seventeenth of the twenty-four solar terms, belongs to the fifth solar term in autumn. As the saying goes, Coody Leng is full of cold dew. As the cold intensifies, everything becomes dim. The rainy season has passed and the weather is dry in most parts of our country.

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.

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 of the stormy weather does not last long, and it is controlled by cold and high pressure, with warm days and cool nights and crisp autumn.

rural activity

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.