Does beginning of autumn mean the end of summer or does the heat of summer mean the end of 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.