Which season does the first frost solar term belong to? What season is the solar term of the first frost?

What season is the solar term of the first frost? What season is the solar term of the first frost in autumn? The first frost is the last solar term in autumn and the transition from autumn to winter. The first frost solar terms are characterized by cold weather in the morning and evening, hot weather at noon, large temperature difference between day and night, and obvious autumn dryness. In autumn, the main climate is dry, and the temperature gradually turns cold. The first frost is a solar term reflecting the temperature change. Cold weather begins with the first frost, which is the last solar term in autumn. It is the transition from autumn to winter, which means that winter is coming. After the first frost, the temperature difference between day and night is large, the weather is cold in the morning and evening, hot at noon, and the autumn dryness is obvious. After the first frost, the plants gradually lost their vitality and the land was desolate. From a scientific point of view, the saying that "dew becomes frost" is not accurate. The frozen dew formed by dew freezing is hard small ice beads. Frost refers to the white ice crystals that condense on the ground or objects when the radiation cooling of the ground cools the air close to the ground below the frost point. Frost refers to the phenomenon of crop freezing injury caused by sudden drop of temperature, so frost does not necessarily occur when frost occurs, and frost does not necessarily occur when frost occurs; However, due to the low temperature during frost, if the temperature continues to drop, it will easily lead to frost. The first frost solar term is generally around the Gregorian calendar1October 23rd 10 every year. At this time, the cold air goes south, the weather is getting colder and colder, and it is colder in the south of China in the morning and evening; However, some parts of the north have already entered winter, and the temperature in some areas has dropped below 0 degrees Celsius. For example, the average temperature in the northeast, eastern Inner Mongolia and most parts of the northwest has been below 0 degrees Celsius. Climatic characteristics of the first frost: the first frost in all parts of China is gradually delayed from north to south and from mountains to plains. Except for areas with frost all the year round, frost first appeared in the north of Daxing 'anling, usually at the end of August. The first frost in most parts of Northeast China, Inner Mongolia and Northern Xinjiang is mostly in September. 10 Frost has appeared in Shenyang, Chengde, Yulin, Qamdo and Lhasa. 165438+1Frost has been seen in Shandong Peninsula, Zhengzhou, Xi 'an and northwest Yunnan in early October; Frost did not appear in eastern China, Hanshui and Yunnan provinces until the beginning of 65438+February. When first frost went from Xiamen and Guangzhou to Baise and Simao, it was the beginning of October after 65438+ years. "The first frost in the first frost" reflects the climate characteristics of the Yellow River Basin. As far as the annual frost days are concerned, there are frost and snow in some parts of the Qinghai-Tibet Plateau even in summer, and the annual frost days are over 200, which is the place with the largest number of frost days in China. The annual frost days in eastern Tibet, southern Qinghai, Qilian Mountains, western Sichuan Plateau, northwestern Yunnan, Tianshan Mountains, Altai Mountains, western mountainous areas of northern Xinjiang, northeast China and eastern Inner Mongolia all exceed 100 days, and the vast areas south of Huaihe River, Hanshui River and east of Dongpo of Qinghai-Tibet Plateau are all below 50 days, with only the annual frost days in the south of 25 north latitude, Sichuan Basin, south of Fuzhou and coastal areas of Guangdong and Guangxi being/kl. In the first frost season, most areas in the north have already harvested in autumn, and even cold-resistant onions can't grow again, because "the first frost can't afford onions, and the longer they grow, the more empty they are." The average temperature in the northeast, eastern Inner Mongolia and most parts of the northwest has been below 0℃, the soil has frozen, and the winter crops have stopped growing and entered the wintering period. For soybean harvest in North China, spring varieties should be selected for late wheat that has not been sown, and seedlings should be checked and replanted for those that have emerged. In the south, it is the peak season of "Sanqiu". Only single-season hybrid rice and late rice are harvested, and early-season wheat and early-season rape are planted. Picking cotton, pulling cotton stalks, ploughing and soil preparation. "The straw is pulled all over the floor, and there will be fewer insect pests and diseases in the future." Take back the straw and stubble in time after harvest, because there are many wintering eggs and germs hidden there. The Chinese cabbage in North China is about to be harvested, so the later management should be strengthened.