Long summer, what season does summer mean?

Chang Xia thinks that summer refers to summer.

Long summer (English name: long summer) is the seventh solar term among the 24 solar terms and the first solar term in summer. The festival is held on May 5-7 of the Gregorian calendar every year. At this time, the bucket handle of the Big Dipper points to the southeast, and the longitude of the sun reaches 45. Almanac: "Dou refers to the southeast, Wei is the long summer, and everything has grown up since then, so it is named long summer."

After the long summer, the sunshine increased, gradually warming, and thunderstorms increased. Long summer is an important solar term, marking the peak season for the growth of all things. In the long summer, everything is thriving. Chang Xia said that bidding farewell to spring is the beginning of summer, so it is also called "the end of spring". Born in spring, grown in summer, harvested in autumn and stored in winter. Because China has a vast territory and a large span from north to south, natural rhythms vary from place to place.

In the long summer season, only the area south of Nanling in China presents the summer scene of "the trees grow dark in summer and the balcony reflects into the pond"; And parts of the northeast and northwest just have the breath of spring at this time.

Meteorological changes:

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.

The arrival of the long summer symbolizes the beginning of the dormant summer, which begins to advance northward and reach North China. 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.