Why is September early autumn? Isn't it early autumn in beginning of autumn?

Beginning of autumn is the 13th solar term in a year and the first solar term in autumn. Although the date is calculated in this way, in meteorology, people will take the average daily temperature below 22 degrees Celsius for five consecutive days as the symbol of beginning of autumn. The division of climatic seasons should be based on the "average climate temperature", that is, the local average temperature is below 22℃ for five consecutive days, which is the real autumn.

China is a vast country. Although the climate varies from place to place, most areas have not yet entered the autumn climate, and the last days of dog days are still the third day after beginning of autumn. Especially in the south of China, this solar term is still a hot summer. At the same time, because the typhoon and rainy season are about to pass and the temperature is even hotter, TCM calls the period from beginning of autumn to the autumnal equinox "long summer".

Extended data:

The first thing that "beginning of autumn" brings is the change of weather. From this day on, the sky was crisp, the moon was bright and the wind was clear, and the temperature gradually dropped. As the proverb goes, "It's cool in beginning of autumn" and "It's autumn in the morning and cold at night". But "beginning of autumn" is very different in the morning and evening. The so-called "beginning of autumn is cold in the morning and beginning of autumn is hot in the evening" reminds people not to be blindly optimistic about "beginning of autumn".

Sometimes, "after beginning of autumn, there is still an (autumn) tiger at one end". In fact, the biggest magic weapon to cool down in beginning of autumn is rain. "There is rain after autumn, and there is wind around the Millennium", which is the conclusion drawn by people's long-term observation. People undoubtedly welcome autumn rain. "People are happy when it rains in early autumn, and people are worried when it rains in summer." .

Under normal circumstances, "beginning of autumn is rainy in summer and Sanqiu is rainy", and it not only rains, but also thunders sometimes, indicating that "it thunders in beginning of autumn, and frost can be seen every hundred days". Every time it rains after "beginning of autumn", the temperature will drop to a certain extent, which is also the reason why the saying "an autumn rain and a cold" is here.

However, it doesn't rain after beginning of autumn. As a sign, "it rains in front of beginning of autumn and there is no drop of water behind beginning of autumn", the most direct consequence is obvious: "It doesn't rain in dry and hot autumn in beginning of autumn, and it rains in rainy autumn in beginning of autumn". "beginning of autumn" has a great influence on farming. In ancient agricultural society, farmers paid as much attention to "beginning of autumn" as festivals.

If the weather is fine in early autumn, it will be fine, and you can wait for a bumper harvest. Similarly, it is important to "beginning of autumn" sooner or later. Everything is harvested in July and lost in June and autumn. It can't be ignored that it doesn't rain after beginning of autumn. "Everything is harvested when it rains in beginning of autumn, and everyone is worried when it doesn't rain in beginning of autumn", because "beginning of autumn is an empty autumn when it doesn't rain, and everything is always half harvested".

It can be seen that "beginning of autumn" is still a sign of bumper harvest. The so-called "autumn is not cold, the seeds are not yellow", "beginning of autumn is full of yellow on the 10th" and "beginning of autumn is full of grass on the 18th". A golden autumn is coming.

References:

Baidu Encyclopedia-beginning of autumn