What will happen to the climate in early autumn?

Beginning of autumn has arrived, but not in 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:

First, astronomical changes.

In this solar term, the sun moves from Cancer to Leo (longitude 135). At night, you can see the bucket handle of the Big Dipper pointing in the direction of Tiangan "Shen" (southwest). The day when it was handed over to beginning of autumn was July of the lunar calendar, which was also called "Shen Yue Day".

In beginning of autumn, the sun is at the declination of+16 19', which is much more southerly than the +23 26' in summer solstice, so the daytime in Beijing is shortened to 14 hours and 04 minutes (15 hours in summer solstice). The weather is still very hot. After beginning of autumn, there are still "crouching" and "autumn tigers" still exist.

So we should pay attention to heatstroke prevention. However, a leopard cannot change his spots. There is a "beautiful day" when it is hot at noon and cool in the morning and evening, and "one autumn rain is cold and ten autumn rains are frost."

Two. rural activity

Beginning of autumn is especially important to farmers' friends. There is an agricultural proverb that says, "Harvest autumn when it thunders" and "Farmers don't work hard when the sun is shining in early autumn". This is the beginning of autumn.

If you hear thunder, crops will fail in winter; If the weather is good in early autumn, we can live in good weather, and we can wait for a bumper harvest without the worries of drought and flood. In addition, there is a saying that "everything is harvested in July and lost in June and autumn" and "the north wind rains before autumn and dries the river bottom after autumn".

In other words, during the beginning of autumn season in July of the lunar calendar, people expect a bumper harvest of grain. If beginning of autumn is in June of the lunar calendar, if it is not mature, the grain harvest will be poor. The north wind blows in front of beginning of autumn, and it will rain after beginning of autumn. If the north wind blows behind beginning of autumn, it may be dry that winter.

According to the standard of dividing seasons according to the average climate temperature, it must be that the average temperature is lower than 22℃ for five consecutive days before autumn is considered. According to this standard, the Jianghuai area generally enters autumn in the middle and late September. After beginning of autumn, although the summer heat is hard to disappear for a while, although there is the afterglow of "autumn tiger", the general trend is that the weather is getting colder and colder. The daily temperature range is gradually obvious, which is often very hot during the day and very cold at night.

Baidu Encyclopedia-beginning of autumn