A few days in summer and a few days in hot summer.

Hot summer * *16 days, hot summer 1 ***6 days.

The summer heat is the twelfth solar term in the twenty-four solar terms of the lunar calendar. At this time, the sun reaches the longitude of the yellow meridian 120 degrees. "Tongwei Filial Piety Helps the Gods": "The fifteenth day of Xia Hou is not summer, but mid-June. The small ones and the big ones are extremely hot, and they are divided into sizes. It was small at first, and it became big after reading it. "

At this time, before and after the mid-autumn period, most parts of China are the hottest period in a year, and the growth rate of heat-loving crops is also the fastest. The working people in China divide the summer heat into three periods: "rotten grass is firefly;" Second, wait for the soil to moisten and cool off the heat; It clears up when it rains. "

There are more than 2000 species of fireflies in the world, which are divided into aquatic and terrestrial species. Terrestrial fireflies lay eggs on hay. During the hot summer, fireflies ovulate, so the ancients thought fireflies were made of rotten grass. The second weather is that the weather began to get sultry and the land was wet. The third weather is frequent thunderstorms. The heavy rain weakened the heat and humidity in summer and the weather began to transition to early autumn.