What changes have taken place in the climate during the hot summer?

Summer is one of the 24 solar terms. The annual summer solar term is around August 23rd. At this time, the sun reaches longitude 150. According to the "twenty-four solar terms", "go and go again, and the summer heat ends here." It means that the hot summer is coming to an end. Although the average daily temperature in Beijing, Tai, An, Cheng, Gui and the vast areas east and south of Tarim Basin in Xinjiang is still above 22 degrees Celsius, which is in summer, the cold air going south is increasing and the temperature is gradually decreasing. According to the "twenty-four solar terms", "go and go again, and the summer heat ends here." It means that the hot summer is coming to an end. Although the average daily temperature in Beijing, Tai, An, Cheng, Gui and the vast areas east and south of Tarim Basin in Xinjiang is still above 22 degrees Celsius, which is in summer, the cold air going south is increasing and the temperature is gradually decreasing. Although the average daily temperature of Beijing, Taiyuan, Xi, Chengdu, Guiyang in the east and south of China and the Tarim Basin in Xinjiang is still above 22 degrees Celsius before and after summer, it is in summer, but the cold air in the south is increasing and the temperature is gradually decreasing.

In ancient China, the summer heat was divided into three stages: "The eagle is a sacrificial bird; Second, wait for the beginning of heaven and earth; " Wait for the third time, Walden. "In this solar term, eagles began to prey on birds in large numbers; Everything began to wither; " "Henaideng" refers to millet, millet, rice and sorghum crops, and "Deng" means maturity.