Climatic characteristics of long summer solar terms, is it hot in long summer?

Long summer is a quiet "blooming" period in early summer in South China, and the northwest and northeast are still in cool weather. Long summer is the first solar term in summer, and then it will experience five summer solar terms: Xiaoman, Mangzhong, Summer Solstice, Xiaoshu and Dashu. Is it hot in that long summer? Let's take a look together.

Climatic characteristics of long summer solar terms: the temperature in south China is higher than that in northeast and northwest China.

In the long summer, the temperature in the north and south of China is very different, and fluctuates frequently in the same area. The temperature in the rest of South China is around 20℃. The low-altitude valley felt hot in summer as early as mid-April, and the temperature in long summer was above 24℃. Therefore, it is also a period of frequent crop diseases and insect pests, and it is a period when people are prone to catch cold. As Heshui Zuo said, "The south is like the summer in the north and the spring in the north. The trees are green and beautiful. When you are sick, the insects disperse the medicine, and the medicine is hot and cold. "

According to the standard of climatology, summer begins when the average temperature of that day rises above 22℃. Before and after the "Long Summer", only the area south of Fuzhou-Nanling Line really entered the summer in China, while some areas in the northeast and northwest just entered the spring at this time, and the average temperature in most parts of the country was around 18-20℃.

Climatic characteristics of long summer solar terms: rainy days in the south of the Yangtze River.

Jiangnan officially entered the rainy season, and rainfall and rainy days increased significantly. Continuous rainy days not only caused wet damage to crops. It can also cause a variety of diseases. Epidemics. The heading and flowering period of wheat is the most susceptible period to scab. If warm but rainy weather is expected in the future, close attention should be paid to spraying chemicals from the early flowering period to the full flowering period. Cotton in southern China often causes outbreaks of anthracnose, damping-off and other diseases under the weather conditions of continuous rain or sudden warming and cold, resulting in large-scale dead seedlings and lack of seedlings. Necessary measures to increase temperature and reduce humidity should be taken in time, combined with chemical control to protect seedlings and strive for strong seedlings.

Climatic characteristics of long summer solar terms: windy and dry in North China and Northwest China.

Before and after the long summer, the temperature in North China and Northwest China rose rapidly, but the precipitation was still not much. In addition, the wind is strong and evaporation is strong in spring. Atmospheric dryness and soil drought often seriously affect the normal growth of crops. Especially, the dry hot wind before and after wheat filling and milk ripening is an important disastrous weather that leads to yield reduction, and timely irrigation is the key measure for drought resistance and disaster prevention. After the long summer, it is the key period for planting early rice in a large area, and the arrival and amount of rain during this period are closely related to the future harvest.