Cold dew explanation
Cold dew is the seventeenth of the twenty-four solar terms, and the time is 65438+1October 7-9 in the Gregorian calendar every year. Cold dew solar terms mean that the temperature drops rapidly. Every solar term, we can clearly feel that the temperature is falling every day. The sunlight in the deep water can no longer penetrate, and the fish swim to the shallow water with higher water temperature. 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 temperature to rise above 30℃, while the minimum temperature can drop below 10℃. There is a proverb in our country called "dew is white before it is cold", which means that dew changes from a little coolness in early autumn to a little coolness in late autumn after the solar terms.
From white and crystal dew to freezing cold, it vividly reflects the continuous decline of temperature. Of course, with the increase of cold, everything begins to enter the dormant period, which is a season of alternating hot and cold in autumn and the beginning of a winter.
In fact, the cold dew solar terms are quite obedient on our side. The most important thing is that the temperature is the lowest in the morning and evening, so the cold dew solar terms are characterized by climate change. After that, the days are basically short and the nights are long. The warm weather gradually fades away, and it will usher in a little chill.
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 of the stormy weather does not last long and is controlled by cold and high pressure. It's warm during the day, cool at night and often crisp in autumn during the day. The weather has also become drier.
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℃.