How are the four seasons divided?

Spring is the first of the four seasons, which generally refers to the period from beginning of spring to long summer in the 24 solar terms, that is, the lunar calendar 1 month to March, the solar calendar from February to May, and the southern hemisphere solar calendar from late September to late February. The remarkable feature of spring is the revival of everything and the changeable climate.

2. Summer

Summer begins with the long summer solar term and ends with the beginning of autumn solar term, that is, from April to June in the lunar calendar and from early May to early August in the solar calendar. The notable feature of summer is high temperature, but because of China's vast territory, the summer climate in different regions is the same, and summer is also the most vigorous season for crop growth.

3. Autumn

Autumn is from beginning of autumn to beginning of winter, that is, from July to September in the lunar calendar and from August to 10 in the solar calendar. After entering autumn, its typical feature is that rainfall and humidity are obviously reduced, and everything in nature begins to show signs of depression and maturity.

4. Winter

Winter begins in beginning of winter in the twenty-four solar terms and ends in the beginning of spring, that is, October to December in the lunar calendar and October to early February in the solar calendar. The remarkable feature of winter is that everything begins to sleep. In most parts of our country, the weather is cold, animals will sleep and migratory birds will fly to warm places for the winter.

The division method of other four seasons

1, astronomical division

From the astronomical phenomenon, the change of four seasons is the seasonal change of the length of day and night and the height of the sun. Therefore, the astronomical division of the four seasons is based on the vernal equinox (March 2 1), summer solstice (June 2 1), autumn equinox (September 2 1) and winter solstice (February 2 1). Namely: spring from the vernal equinox to the summer solstice, summer from the summer solstice to autumn, autumn from the autumn equinox to the winter solstice, and winter from the winter solstice to spring.

2. Meteorological zoning method

In meteorological departments, March-May is usually spring, June-August is summer, September-1 65438+1October is autumn, 65438+2- February is winter, and1,4, 7,1the following year.

3. Ancient division

Take beginning of spring (February 4th or 5th) as beginning of spring, Changxia (May 5th or 6th) as long summer, beginning of autumn (August 7th or 8th) as beginning of autumn and beginning of winter (165438+1October 8th or 9th) as beginning of winter.

4, the lunar calendar division method

In our country, it is customary to divide the four seasons by lunar month. Lunar calendar1~ March is spring, April-June is summer, July-September is autumn, and 10 ~ 12 is winter.

5, waiting for the temperature division method

This division is based on waiting time (five days is a waiting time). Take the average temperature as the temperature index to divide the four seasons.

Summer begins when the average climate temperature is stable above 22℃, winter begins when the average climate temperature is stable below 10℃, and spring and autumn begins when the average climate temperature is between 10 ~ 22℃. 10℃ to 22℃ is spring, and 22℃ to 10℃ is autumn. The division of four seasons, not only the climate in different parts of the earth is very different, but also in different seasons in the same area.