According to climate statistics, how are the four seasons in the world divided?

Spring, summer, autumn and winter are called four seasons. There are different standards for the division of the four seasons.

Astronomically speaking, the spring equinox (about March 1), summer solstice (about June 22nd), autumn equinox (about September 23rd) and winter solstice (about12,21) are four seasons. In Chinese ancient books, beginning of spring (around February 4th), Changxia (around June 5th), beginning of autumn (around August 8th) and beginning of winter (around165438+1October 8th) are often used as the beginning of the four seasons. According to climate statistics, June 5438+ 10 is the most Leng Yue, July is the hottest month, March, April and May are spring, June, July and August are summer, and September, June 10, June 1 are autumn. This method of dividing the four seasons is more suitable for temperate regions with distinct seasons.

1934, China scholar Zhang Baokun combined phenology with agricultural production and put forward another seasonal method. It starts in winter when the average temperature keeps falling below 10℃ and in summer when the average temperature keeps rising above 22℃. When the average temperature rises steadily from below 10℃ to above 10℃, it is regarded as beginning of spring. Autumn begins when the temperature drops steadily from above 22 degrees Celsius to below 22 degrees Celsius. That is, the seasonal average temperature is ≤ 65,438+00℃, the winter temperature is 65,438+00 ~ 22℃, the spring temperature is ≥22℃, and the summer temperature is 22 ~ 65,438+00℃, so it can be widely used in combination with local specific climate and agriculture.