The fifteenth day after the slight summer heat means that it is not a great summer heat; The solar ecliptic is120; Gregorian calendar on July 22-24. "Summer heat" means heat, and great summer heat means extreme heat.
The summer heat is relatively mild and hotter, and it is the most sunny and hottest solar term in a year, and the "damp-heat steaming" reaches its peak at this time. Climatic characteristics of the great summer: high temperature and scorching heat, frequent thunderstorms and typhoons.
During the summer heat, just before and after mid-summer, the weather entered the hottest period of the year, which coincided with the same season of rain and heat, and the rainfall increased significantly compared with other months. Monsoon climate is the main feature of China's climate. In summer, affected by the warm and humid air flow from the ocean, many places in China are hot, humid and rainy.
At this time, the sunshine is fierce, the temperature is high, the humidity is wet and the rain is rainy. Although it is hard to avoid the pain of damp and heat, it is very beneficial to the growth of crops, and the crops grow fastest during this period.
Every year in late July (after the solar term of the Great Summer), the subtropical monsoon rain belt moves to North China-Northeast China, and from late July to early August (called "seven falls and eight rises") is the rainy season in North China, Northeast China and other northern regions; However, the northwest region is the arid region with the least annual precipitation in China because it lives inland and is far away from the ocean.