Today (September 23), our country ushered in the autumnal equinox solar term, and the coolness is getting stronger, especially at night, which is cooler overnight. Through the inventory of big data, it can be found that the minimum temperature in the north dropped rapidly during the autumn equinox, the temperature difference between day and night in many places exceeded 10 °C, the scope of the first frost began to spread rapidly, and the autumn territory reached its peak.

Autumnal equinox solar term, Huanghuai, Jianghuai and other places speed up the fall, and the autumn territory reaches its peak

During the annual autumn equinox and solar terms, most of our country enters autumn, and the autumn territory reaches its peak. From North China to the middle and lower reaches of the Yangtze River, the autumn is high and the air is cool. The northeast and other places are beginning to frost and cold dew winds begin to emerge. The autumn rains in the southwest and other places are just in time. The Yangtze River Basin basically completes the transition from summer to autumn during the autumnal equinox solar term.

According to Hu Xiao, chief meteorological analyst at China Weather Network, when the annual autumn equinox begins, the frontier of my country's autumn has crossed the Huai River and arrived in central Anhui, central Jiangsu, and central Hubei. With the increase of cold air, the temperature in the middle and lower reaches of the Yangtze River has gradually declined in fluctuations. Nanjing (September 25), Hefei (September 26), Wuhan (September 29), Chongqing (September 28), Changsha (September 28th), Nanchang (October 6th), Hangzhou (September 30th), Shanghai (October 2nd) and other provincial capital-level large cities all year round the average date of entering autumn is concentrated in the autumn equinox.

Compared with normal years, the process of entering autumn in most parts of my country this year is roughly the same as that of normal years. However, due to the frequent cold air in the early stage of Northeast China, the time of autumn is about 10 days earlier than normal; Beijing, Tianjin and Shijiazhuang are later than normal. about a week.

The temperature difference between day and night in many places in the north exceeds 10 °C, and Yinchuan ranks first

"White dew on the autumnal equinox, one night is cold one night." The autumnal equinox is not only an important period for the change of seasons, but also a time when cold air tends to be more frequent. As soon as the autumn equinox arrives, the cold air going south meets the gradually decaying warm and humid air, which will produce repeated precipitation processes, and the temperature will also drop.

Hu Xiao said that the increasing temperature difference between day and night in the north and the daily drop in temperature are a major climatic feature of the autumn equinox, especially the rapid decline in the minimum temperature. Data show that during the autumnal equinox, the national average maximum temperature is 20.8 °C, the minimum temperature is 9.1 °C, and the temperature difference is 11.7 °C, of which the national average minimum temperature drops below 10 °C for the first time.

It can be seen from the ranking of the temperature difference between day and night in the major cities on the annual autumn equinox solar terms, all the cities on the list are northern cities, with Yinchuan ranking first, with a temperature difference of 13°C; followed by Shenyang, Hohhot, Xining, Taiyuan, with a temperature difference of more than 12°C; Harbin , Changchun, Lanzhou, Tianjin, Beijing and other places have also made the list, with a temperature difference of over 10°C. During the autumn equinox, the temperature difference between day and night in the north increases, and it is cool to go out in the morning and evening. It is necessary to add clothes in time to prevent colds.

Early autumnal equinox frost map released

Entering the autumnal equinox solar term, along with cooling, the scope of the first frost in the north also expanded rapidly. When the temperature drops below 0°C at night, the dew condenses into frost. Judging from the perennial frost map at the beginning of the year, Heilongjiang, Jilin, northern Xinjiang, northeastern Inner Mongolia, northern China, and north-central Northeast China, as well as places with higher altitudes in the eastern part of Ningxia and Qinghai, all experienced initial frosts during this period. Entering October, the scope of the first frost continued to expand south, and the first frost was also seen in Beijing, Tianjin, Hebei and other places. It is expected that in late October, the initial frost line will gradually advance to the Huaihe River Basin and the Qinling Mountains.

The autumn equinox is also set as the "Chinese Farmers Harvest Festival", which is the "three autumns" production period of autumn harvest, autumn ploughing and autumn planting. In addition to the first frost, autumn rain, cold dew wind, heavy fog, etc. These weathers need to focus on prevention.

The coldness of the autumn equinox is getting stronger, and the scientific "autumn freezing" is exquisite

The ancients of our country divided the autumnal equinox into three phases: first, when the thunder began to be heard; second, when the stinging insects began to dry up; In the autumn equinox, the thunder gradually ends, the summer heat subsides, and the autumn cold begins; the weather becomes colder, and the hibernating insects begin to hide in their burrows; the weather gradually dries up, the water vapor evaporates quickly, and the water volume of rivers and lakes decreases.

Following the characteristics of the autumn equinox, preventing autumn cold and autumn dryness is the main point of health care at this time. You can eat more fresh fruits and vegetables that are sweet and nourishing and moisten the lungs, such as autumn pears, lilies, etc. You can also do some soothing sports such as jogging and yoga to exercise and resist the autumn cold.

As the saying goes, "spring covers autumn freezes", but "autumn freezes" should also pay attention to science. In areas that have just entered the autumn, you can gradually increase the clothes according to the weather changes. Don't rush to change into thick clothes. At the same time, pay attention to exercise. Proper exercise can help improve the body's cold resistance and enhance immunity.