What month is the hottest this year? When is beginning of autumn?

It's hottest in July and August this year, and it's in beginning of autumn on August 7th. This year is 223. After the summer solstice, the position of the sun gradually moves southward, the time of the sun's irradiation is shortened and the distance is getting farther and farther, and the radiant heat is gradually reduced. But every day, the heat absorbed by the earth is still more than the heat lost, and the heat is getting bigger and bigger. Therefore, July and August after the summer solstice are the hottest times in the northern hemisphere. In the four seasons, August 7 or 8 is the beginning of autumn among the 24 solar terms, too.