In meteorology, how are the four seasons distinguished?

In meteorology, the four seasons are divided according to the average temperature.

In order to accurately reflect the actual temperature changes in various places, China often uses the classification method of modern scholar Zhang Baokun to divide the four seasons, that is, the "average temperature". According to this classification, the period when the average temperature is greater than or equal to 22℃ is summer, the period when it is less than or equal to 10℃ is winter, and the period between 10℃ and 22℃ is spring or autumn.

According to this standard, the seasons in mid-latitude areas are basically consistent with the "average climate temperature". The general results are as follows: March-May is spring, June-August is summer, September-165438+1October is autumn, and12-February is winter.

Extended data

Other ways to divide the four seasons are:

1, traditional four legislation

This method takes the "four stands" in the 24 solar terms as the starting point of the four seasons, and takes the dichotomy and two-to-two as the midpoint. For example, in spring, the starting point is beginning of spring, the solar line is 3 15, the spring is divided into the midpoint, the long summer is the end point, the solar line becomes 45, and the sun runs 90 on the ecliptic. The rotation of the four seasons reflects the changing laws of phenology and climate.

2. Western classification

In other words, the western classification of the four seasons emphasizes the climatic significance of the four seasons, taking the bisector of the sun as the starting point of the four seasons, such as spring as the starting point and summer solstice as the end point. These four seasons are one and a half months later than the traditional four seasons in China.

Baidu encyclopedia-four seasons