Summer is one of the 24 solar terms. The solar term falls on August 23rd or 24th every year, which is a solar term reflecting the temperature change. "Chu" means termination, which means that the heat is about to pass, the summer heat will end on this day, and the temperature in most parts of China will gradually drop.

Being in summer is not only different from mild summer heat and severe summer heat, but also different from slight cold and severe cold solar terms. It is a solar term representing the transition from hot to cold. First, the direct point of the sun continues to move southward, and the solar radiation weakens; Secondly, the subtropical high retreated to the south by leaps and bounds, and the Mongolian cold high began to itch to try, punching its feet and showing its edge. The climate during the summer is characterized by hot in the daytime, cool in the morning and evening, large temperature difference between day and night, less precipitation and low air humidity.