Information about autumn

Autumn is one of the four seasons. According to modern meteorology, autumn in north temperate zone is from August 23rd (summer) to165438+1October 20th (light snow). Autumn in the south temperate zone is from February 19 (rain in the northern hemisphere) to May 2 1 (xiaoman in the northern hemisphere).

Entering autumn means that rainfall and storms tend to decrease or decrease, and everything in nature begins to mature from lush. The beginning of autumn does not mean the end of hot weather. As the saying goes, "the summer heat is in dog days", according to the calculation method of "dog days", beginning of autumn is often in dog days until the summer heat, so the weather is still very hot in early autumn, and it will generally get cold after the Millennium solar terms.

The watershed of summer heat is in autumn, not at the turn of summer and autumn. The climate in autumn is divided into two stages, the early autumn is sultry, and the climate tends to be dry and cool after the Mid-Autumn Festival. Generally speaking, in autumn, the height angle of the sun gradually decreases, and the temperature gradually decreases from heat; The autumn wind is cool, the summer heat is gone, the fruits are covered with branches, and the fields are golden.

Extended data:

temperature

According to the average climate temperature of modern scholar Zhang Baokun, there are four seasons in a year. The index is that the average temperature is lower than 10℃ in winter, higher than 22℃ in summer, and 10~22℃ in spring and autumn respectively.

The standard of average temperature in autumn adopted in meteorology is: after the intense summer heat, the average temperature for five days will be kept below 22℃, that is, it will enter autumn, and when it is lower than 10℃, it will end in autumn (average temperature: 0: 00, 6: 00, 12, 18) and enter autumn.