China's statement that "long summer sees summer" refers to the season of long summer.

There is a saying in China that "see summer in long summer", which means that the harvest in long summer season is basically certain.

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On the day of long summer, many places have the custom of eating "long summer rice", eating eggs, weighing people and tasting three delicacies. Entering the long summer, people's metabolism is accelerated, and blood supply to the heart and brain is insufficient, which often makes people fidgety, tired and lazy. It is necessary to arrange work and rest time reasonably, supplement nutrition and adopt correct health care methods.

One of the climatic characteristics of the long summer solar terms is the obvious increase of showers and thunderstorms. The increase and intensity of precipitation are caused by the confrontation between cold and warm air and the convective weather caused by the rise of warm and humid air near the ground. Long summer is an important solar term, marking the peak season for the growth of all things.

According to the classification standard of modern climatology (climate average temperature) in China, the daily average temperature rises steadily to above 22℃, starting in summer. Before the arrival of the long summer solar term, the scope of spring in China reached its peak. Except Hainan, Guangdong, Guangxi, south-central Jiangxi, southern Hunan and Fujian, it was summer, and most other areas were still spring.

After the long summer officially entered the rainy season, rainfall and rainy days increased significantly. Summer is the best season for many crops to grow vigorously. Adequate light, suitable temperature and abundant rain provide necessary conditions for plants.

In summer, affected by the warm and humid air flow from the ocean, the southern region is generally hot, humid and rainy. Qinling-Huaihe river basin is a transitional area between rainy south and rainy north. From the vicinity of Huaihe River in Qinling Mountains to the north, the rainfall decreased sharply. In the long summer, everything is thriving. Because China has a vast territory and a large span from north to south, natural rhythms vary from place to place.

Before and after the "long summer", only the area south of Fuzhou-Nanling line in China may enter summer, and most of the rest areas are still in spring, and some areas in Northeast China and Northwest China even just entered spring at this time.

After entering the long summer solar term, the rainfall in the middle and lower reaches of the Yangtze River and South China increased rapidly in mid-May, and South China also entered the peak period of the first flood season.

The rainstorm at this time often has the characteristics of continuity in time, extensiveness in region and fierceness in intensity. In the Pearl River system of Guangdong and Guangxi and the Minjiang River system of Fujian, the highest annual water level often appears at this time. There is a folk saying that "the summer is full, the small one is full, and the river is full".