Judging winter climate from beginning of autumn time.

Beginning of autumn time: August 6th-9th every year.

As the saying goes, "It's cool in beginning of autumn", which obviously associates beginning of autumn with cool weather. It seems that the beginning of autumn is the beginning of cool autumn. Because of the different latitudes and altitudes, it is practically impossible to enter autumn at the same time in beginning of autumn.

Climatology takes the 5-day average temperature between 10℃ and 22℃ as the standard of spring and autumn. In China, except those places with high altitude in the north latitude, beginning of autumn is still in the hot summer, and even in most parts of the northeast, there is still no autumn scenery with cool breeze and yellow leaves fluttering.

The beginning of autumn indicates the arrival of autumn. From this day on, the sky was crisp, the moon was bright and the wind was clear, and the temperature gradually dropped.

From the climate characteristics, beginning of autumn is called "autumn tiger", because of the residual temperature in midsummer and the scorching sun in autumn, especially around beginning of autumn, many areas are still in hot weather. Meteorological data show that this hot climate often lasts until the middle and late September, and the weather can really cool down.

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 means that if you hear thunder at the beginning of autumn, the crops in winter will fail; If the weather is fine in early autumn, we can live in fine weather, and there will be no worries about drought and flood in farming, so we can wait for a bumper harvest.

In addition, there are "July autumn, everything is harvested, June autumn, everything is lost", "the north wind before autumn, the rain after autumn; After autumn, the north wind dried the bottom of the river. In other words, during the beginning of autumn season in July of the lunar calendar, people expect a bumper harvest of grain. If autumn begins in June of the lunar calendar, people will apologize if the grain is not ripe; 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 this winter.