What does summer mean?

"Chu" means to hide and die, and "early summer" means that the hot summer has passed. After the summer solar term, it means that the hot weather is coming to an end, but it does not mean that there will be no hot weather in the future. On the one hand, this year's "dog days" are not over yet. On the other hand, due to the influence of "autumn tiger", the high temperature will continue for a period of time after the summer, but the temperature will drop in the morning and evening, and there is still a high temperature of more than 30 degrees only at noon.

Among the people, different regions have different customs. For example, in Guangdong, Guangxi and other places, there is a custom of boiling herbal tea, because it will continue to be sultry after summer, and boiling herbal tea can alleviate the summer heat; For areas living in coastal areas, there will be a custom of "fishing festival", because after the summer, that is, the end of the fishing ban, fishermen will go fishing in the sea; In addition, there is a custom activity of "going out to welcome autumn". After summer, autumn is getting stronger, which is a good season to welcome autumn and enjoy the scenery. There are some differences in customs and activities in different regions.

From the perspective of agricultural planting, there are also many agricultural proverbs about summer heat, such as "When the summer heat turns yellow, beware of strong winds", "When the summer heat is over, the millet will be harvested, and the white dew will be harvested", "When the summer heat is over, the cabbage will be moved and the seedlings will squat in the sun" and so on. Those who should be managed should be managed in time, and those who should be harvested should be harvested in time so as not to miss the farming season.

Weather characteristics of summer solar terms;

Radiation attenuation

It is not enough to describe the solar terms in summer simply by the beginning of temperature drop. Temperature drop is just one of the phenomena. The reasons behind this phenomenon are as follows: first, the direct point of the sun continues to move southward, and the solar radiation weakens; Second, the subtropical high moved southward by leaps and bounds, and the Mongolian cold high began to itch to try, punching and kicking, showing its edge.

A dry and warm climate in late autumn

Autumn Tiger occurs after beginning of autumn in 24 solar terms, which is a short-term high temperature weather. It is as overbearing as a tiger, so people call it "autumn tiger". It usually occurs between August and September, and the duration of autumn tiger varies from year to year, usually lasting for half a month to two months. Although the temperature is high, generally speaking, the air is dry and sunny, and the temperature difference between morning and evening will not be too high. The reason for the autumn tiger weather is that the subtropical high, which was withdrawn from the south, resumed control again, resulting in high temperature and hot weather with crisp weather and strong sunshine. The reason for the formation of autumn tiger is that the western Pacific subtropical high that controls China gradually moves southward in autumn, but moves northward. Under the control of this high pressure, it is partly cloudy, sunny to sunny, with strong sunshine and rising temperature. Although it is autumn, it is sultry.

Although the subtropical high, which is dominant in summer, strides south, it will never give up its advantage easily and retreat to the sea of the western Pacific easily. In the southern region under its control, people who just feel a little cool in autumn often feel hot weather in late summer, which is a veritable "autumn tiger". For areas that have just stepped out of the dog days and suffered from severe summer drought, if they continue to be controlled by subtropical high, it is often easy to form drought in summer and autumn, which greatly advances the fire prevention period in autumn and needs vigilance. What needs to be said is that the middle and lower reaches of the Yangtze River often welcome the crisp autumn spring after the autumn tiger weather, but it will wait until after 10. During this period, the general trend of rainstorm in all parts of the country weakened.

dry

The cold high pressure that began to affect our country, under its control, formed sinking dry cold air, which first announced the end of the rainy season in northeast, north and northwest China. During the hot summer, the only places where the temperature dropped significantly were the northeast and northwest regions. But whenever cold air affects China, if the air is dry, it will often bring windy weather, and if there is warm and humid airflow in the atmosphere, it will often form a decent autumn rain. After every storm, especially after the rain, people will feel more obvious cooling. So there is a saying: "an autumn rain (wind) is a cold." There may be a large precipitation process in the north and south Jianghuai areas. The temperature dropped significantly, and the temperature difference between day and night increased. It is sunny after the rain, and people often don't adapt to the cold and hot changes at the turn of summer and autumn. If you are not careful, it is easy to cause diseases such as respiratory tract, gastroenteritis and cold.

Thunderstorm activity

South China, Southwest China and West China.

Thunderstorms are not as active as in summer, but there are still many thunderstorms in South China, Southwest China and West China. In the south of China, there are more thunderstorms than in other places because the warm and humid airflow at low latitudes is still active. In the southwest and west, there are more thunderstorm activities due to the subtropical high edge and mountains. In September, most parts of China began to enter a period of little rain, while there were more autumn rains in West China. This is a special weather phenomenon in autumn in western China. The scope of autumn rain in West China includes autumn rain in Sichuan, most of Guizhou, eastern Yunnan, western Hunan and western Hubei, in addition to the Weishui and Hanshui basins. Early autumn rain will appear in late August. The earliest appearance date can sometimes start from the end of August and end in the end of 165438+ 10 at the latest. But the main rainfall period occurs in September and June, 10. The main feature of "Autumn Rain in West China" is that there are many rainy days, and another feature is that it mainly rains in Mao Mao, so although there are many rainy days, the rainfall is not very large, generally less than that in summer, and the intensity is weak.