When does the summer heat alternate with the autumn wind? Is it this time every year?

The annual solar term alternation time is basically the same, with a deviation of 1 and 2 days. Because the time of the earth's revolution is not 365 days, there are still a few hours left, so it is impossible to have the same time every year.

The summer heat is around July 23rd every year, just before and after midsummer. This period is the hottest period in a year in China's vast areas, but there are also abnormal years, "there is no heat in summer" and there is more rain.

The autumnal equinox, around September 22nd every year, the point of direct sunlight returns to the equator, forming the same length as day and night.