4hw.com.cn: in the hot summer, it's hard to bear the heat. Many people are looking forward to the end of summer and the cooling. When will it cool down in 2018? Why is it the hottest in the dog days? Let's have a look.
When will the temperature drop in 2018
It will not be hot until August 22-25, 2018. After the end of autumn tiger, the weather will gradually turn cool.
Because after the beginning of autumn, there will be a period of short-term heat recovery weather, above 35 ℃, known as the autumn tiger. It usually occurs at the turn of August and September and lasts for about 7-15 days.
The beginning of autumn in 2018 is on August 7, and the end of autumn is half a month after the beginning of autumn, which is about August 22. Then this time hasn't come out yet. The last day of the dog days in 2018 is August 25, so the dog days will end on August 26.
So when will the temperature drop in 2018 be between August 22-25.
Three hot days
After falling into the ground, the surface humidity increases, more heat is absorbed every day, less heat is emitted, and the heat of the surface layer accumulates, so it gets hotter day by day, entering into the third volt, the accumulated heat of the ground area reaches the highest peak, and the weather is the hottest. In addition, there is more rain in summer, and the air humidity is large. The heat capacity of water is much larger than that of dry air, which is also an important reason for the sultry weather. In July and August, the subtropical high was strengthened. Under the control of the subtropical high, the downdraft inside the high pressure made the weather clear and cloudless, which was conducive to the sunshine, the ground radiation increased temperature, and the weather was even hotter.
Climatic characteristics of the beginning of autumn
1. There are "autumn tigers" in the beginning of autumn
It's cool in the morning and evening, and there's still residual heat at noon. But it's not that the climate of autumn has arrived. It is usually still very hot at this time. There is still a "Fu" after the beginning of autumn, and the "autumn tiger" still exists. The division of climate season should be based on the 'average temperature of climate', that is, the local average temperature for five consecutive days is below 22 ℃, which is the real autumn season.
2. In the beginning of autumn
China is a vast country with different climates, but at this time most of the regions still do not enter the autumn climate. Moreover, the last day of the hot and humid days is the third day after the beginning of autumn. Especially in the southern part of China, when the solar term is still summer and summer, the weather season is gradually gone and the temperature is even hotter. Therefore, the period from the beginning of autumn to before the equinox in Chinese medicine is called "long summer".
3. The weather is different between North and South at the beginning of autumn
The earliest areas of Heilongjiang and Northern Xinjiang in autumn also begin to fall in the middle of August. In general years, the autumn wind in the capital Beijing starts to cool in early September. The autumn in Qinhuai area starts in the middle of September. In early October, the autumn wind blows to the front lines of Lishui, Zhejiang, Nanchang, Jiangxi and Hengyang, Hunan. In the first half of November, the information of autumn arrives at Leizhou Peninsula. When autumn arrives at Yaxian, Hainan, the "end of the earth" It's almost new year's day.