When is the coolest in early autumn?

Beginning of autumn is the 13 solar term among the 24 solar terms, and the 8th or 9th of August every year is usually beginning of autumn time. People in China always say, "It's early autumn and it's very cold. In late autumn, it is hot and dead. " Statement!

However, judging whether beginning of autumn is earlier or beginning of autumn is later has always lacked scientific basis. However, there has always been a folk proverb in China, "It's early autumn and the weather is very cold. In late autumn, it is hot and dead. " Statement. So, what is early autumn? Can this folk proverb really predict the weather accurately? In fact, every solar term indicates that the earth is in a certain position in its orbit around the sun. When the sun reaches 135 degrees, it is beginning of autumn. Therefore, from the astronomical point of view, beginning of autumn is only a specific moment. The so-called "early autumn" means that the time in beginning of autumn is before the sun comes out.

According to the data of Beijing Meteorological Observatory, during the period from 1990 to 1999 10, the early autumn was earlier in five years and later in five years. However, on the day after beginning of autumn in 10, the 9-year average temperature was 24.8℃ higher than that in the same period. Only in 1992, the average temperature in beginning of autumn after 10 was 24.0℃, which was lower than that in the same period, and this year happened to be later in beginning of autumn. The main factors affecting climate change are solar radiation, lower heating surface, atmospheric circulation and human activities. According to the present scientific level, we can't see what effect beginning of autumn will have on the climate sooner or later.

So, when will beginning of autumn be 20 12? 20 12 beginning of autumn time is August 7th 10: 30: 32, which is the beginning of the dog days. As the old saying goes, beginning of autumn is too late. So this is a normal phenomenon.