The summer heat is usually on July 6-8 in the solar calendar; The summer heat usually falls on July 22-24 in the solar calendar. Slight summer heat, great summer heat and solar calendar can't be fixed, therefore, slight summer heat, great summer heat and week can't be fixed.

The summer heat is one of the 24 solar terms, with the northern hemisphere between July 22 and 24, the southern hemisphere between 1 month 20-2 1 day, and the sun at120. During the summer heat, Han people have the customs of drinking tea, drying ginger and burning incense.

"twenty-four solar term" said: "Summer heat, heat also, on the heat is divided into size, small at the beginning of the month, big in the middle of the month, and now it is hot in Judah." Its climatic characteristics are: "Dou refers to C as a great summer heat, and the weather in Sri Lanka is stronger than a small summer heat, so it is called a great summer heat." The summer solar term is just before and after the "midsection" in the "dog days". It is the hottest period in a year, with the highest temperature and the fastest growth of crops. At the same time, various meteorological disasters such as drought, waterlogging and wind disasters are also the most frequent in many areas.