I remember when I was a child learning about the four seasons, our understanding seemed to be like this: divide the 12 months of the year into 4 parts, one for one season, that is to say, the month is spring, the month is summer, the month is autumn, and the month is winter. In fact, this is seriously wrong.
Later, after learning the lunar calendar, spring is the lunar month, summer is the lunar month, autumn is the lunar month, and winter is the lunar month. In fact, this is also inaccurate.
Later, after learning the method of dividing the solar terms, I learned how to judge the seasons according to the solar terms, which may be the most accurate for many people. After the beginning of spring is spring, after the beginning of summer is summer, after the beginning of autumn is autumn, after the beginning of winter is winter. If you are a student, it seems that there is no problem at all when you answer this question on the test paper, but in practice, it seems that it does not make sense. Let's take a real-life exampleMany places in the north have already entered autumn before the beginning of the autumn solar term, but Guangdong and Hainan have already passed the beginning of the winter solar term, and the local area is still summer, why is this?
This requires the division of the seasons from a meteorological point of view. From a meteorological point of view, the division of the seasons is based on changes in temperature. Specifically, the division of the four seasons of spring, summer, autumn, and winter is as follows:
Spring: The average temperature is greater than 0 but less than 22;
Summer: the average temperature is greater than 22;
Autumn: Average temperature greater than 10 but less than 22;
Winter: The average temperature is less than 10.
Among them, "waiting average temperature" refers to the average of the daily average temperature for 5 consecutive days.
China has a vast territory, and the climate varies greatly from place to place, so it is obviously unreasonable to define the seasons by a uniform time period. Now that you have understood the division of the four seasons from the perspective of meteorology, have you now understood why it is already winter, and Guangdong and Hainan are still crazy hot?