Natural Characteristics of Summer Solstice

Climate characteristics of the summer solstice

(1) Convection weather

After summer, the ground is heated intensely and the air convection is strong. Thunderstorms often form from afternoon to evening. This kind of thermal thunderstorm comes and goes suddenly, and the rainfall range is small. People call it "Xia Yu Dividing Fields". Liu Yuxi, a poet of the Tang Dynasty, cleverly borrowed this kind of weather and wrote the famous poem "The sun rises in the east, and when it sets in the west, it rains, but the road is clear." The heavy rainfall caused by convective weather is not as beautiful as described in the poem, and often brings local disasters. In the poem "In the Summer Rain", the poet Xu Shuxin also gave an apt description of the thunderstorm weather in summer: "In summer, when the wind blows, people sit on the stage, frogs and cicadas make noisy noises and beat the dust. The golden gongs ring in the air, and the cold rain Like money."

(2) Heavy rain weather

In most cases, during the "summer solstice", it is the rainy season in the middle and lower reaches of the Yangtze River and the Yangtze-Huaihe River Basin. Frequent heavy rains can easily cause floods and even threaten people's lives and property. Therefore, we should pay attention to strengthening flood prevention.

(3) Jianghuai Plum Rain

Summer is the "Meiyu" season in the Jianghuai region, and it is the yellowing and ripening period of plums in the Jiangnan region. The air is very humid, and warm and cold air masses meet here to form a low-pressure trough, resulting in continued rainy weather. In such weather, the utensils become moldy and people feel uncomfortable. Some mosquitoes breed quickly, and some intestinal bacteria breed easily. At this time, pay attention to drinking water hygiene and try not to eat raw or cold food to prevent the occurrence and spread of infectious diseases.

(4) High-temperature sauna

The summer solstice, like the winter solstice, is a solar term that reflects the changes in the four seasons. Astronomy dictates that the summer solstice is the beginning of summer in the Northern Hemisphere. After the summer solstice, although the direct point of the sun gradually moves southward, the days in the northern hemisphere are getting shorter and the nights are getting longer. However, since the heat radiated from the sun to the ground is still more than the heat radiated from the ground to the air, the temperature will continue to rise in the future, so there is a saying that the summer solstice is not too hot. Judging from the data from 1951 to 2006, the historical extreme values ​​of many cities in northern China appeared after the summer solstice.