The origin of the great summer heat and its climatic characteristics.

1. Climatic characteristics of severe summer heat: high temperature, humid heat and frequent thunderstorms. High temperature and rainy, rain and heat at the same time, is conducive to crop growth. The summer heat is the solar term with the most sunshine, the highest temperature and the most thunderstorms in a year.

2. Generally speaking, the summer solar term is the period with the most sunshine and the highest temperature in South China, the period with abundant rain, the most common thunderstorm and the most concentrated days of high temperature above 30℃ in the west of South China, and the period with the most frequent occurrence of high temperature above 35℃ in the east of South China.

3. There are sayings in Jiangnan that "summer rain is as light as silver and as heavy as gold", "it rains in rainy days, and it hoards many meters every day", "it rains in rainy days, and it is rich in grain and cotton" and "it is not affected by drought, and one acre is added with one load". In this hot season, raindrops are like gold.

4. The inland areas in the north are dry and hot in summer, which is the period with the highest temperature in a year; The annual precipitation is mostly 400-800 mm, and the precipitation is concentrated in July and August. Since the summer solar term, the northern part of China has entered the period with the most rain in the whole year.