The four seasons are divided by months.

The four seasons are divided by month:

The first division: divide by four quarters.

The first quarter: 1, February and March; The second quarter: April, May and June; The third quarter: July, August and September; Section IV: 10, 1 1, 65438+February.

The second division method: according to the solar terms.

Spring: February 3-May 4; Summer: May 5-August 6; Autumn: August 7th-165438+1October 6th; Winter:165438+1October 7-February 2.

The third division is to divide the four seasons into spring, summer, autumn and winter according to meteorological indicators. This division depends on the temperature change of the year, and it is not fixed.

Four seasons refer to four seasons that appear alternately in a year, namely spring, summer, autumn and winter, and each season lasts for three months. All the year round is formed because the earth revolves around the sun. Due to the existence of the ecliptic angle, the direct point of the sun moves back and forth between the north and south latitudes of the earth, which leads to the change of the height of the sun at noon and the length of day and night, thus resulting in seasonal changes.

The commonly used methods of season division mainly include "solar terms method" and "temperature method". Traditionally, China begins with four solar terms (beginning of spring, Changchun, beginning of autumn and beginning of winter).

Zhang Baokun, a modern scholar, put forward a new standard for the division of seasons. The average temperature (the average temperature for five consecutive days) is beginning of winter, and when it rises above 22℃, it is long summer. The average temperature in spring or autumn is 10-22℃.