After the summer solstice, the sun returned to the south. Why is it still hot?

(1) Because more than 70% of the earth is water, its specific heat capacity is relatively large. Before the summer solstice, the seasons on the earth experienced winter and spring. These two seasons are cold and the surface temperature is low, so a considerable part of solar radiation is absorbed by the surface, so it is not too hot. After the summer solstice, the heat absorbed by the earth reaches a certain level, and geothermal energy is sufficient. At this time, only a small part of the heat radiated by the sun is absorbed by the surface, and most of it is reflected back to the atmosphere. The hottest weather also appears at this time.

(2) In the atmosphere, the frontal rain belt formed by the northward movement of wind pressure belt in summer moved northward along the eastern coast of China at 7.8, and then it was controlled by subtropical high, prevailing downward flow, which was not easy to cause rain, mainly due to summer drought and hot weather.

In September+10, 65438, the frontal rain belt retreated rapidly, thus "an autumn rain and a cold". These areas are often affected by tropical cyclones between two periods.