What is beginning of winter? What's the change in the weather?

Beginning of winter is one of the 24 solar terms. Besides the cold weather, there are other weather changes in early winter. So what is beginning of winter? What is the weather change in early winter? Next, let's take a look at this issue of the old almanac!

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What is beginning of winter? It is one of the 24 solar terms. The bucket refers to beginning of winter in the northwest, and the solar calendar is 225. It is on the Gregorian calendar165438+1October 7-8. Beginning of winter is a seasonal solar term, and beginning of winter said that winter begins. After beginning of winter, the sunshine time will continue to shorten, and the height of the sun will continue to decrease at noon. Beginning of winter, in ancient society, was one of the "four seasons and eight festivals" among the people, and people generally held sacrificial activities. Beginning of winter is not only the first season of winter, but also an important festival celebrated in many places in ancient China.

What is the weather change in early winter? According to statistics, an average of 2-3 tropical cyclones are generated in June165438+1October every year. In particular, cyclones generated in the northwest Pacific may develop into typhoon intensity. In the past 55 years, there have been 1 1 tropical cyclones landing in China's coastal areas in1month, mainly in Taiwan Province Province, Guangdong Province and Hainan Province. If zonal circulation prevails in mid-latitude, tropical cyclones are more active, and if meridional circulation prevails in mid-latitude, that is, cold air is stronger, typhoons are not easy to occur.

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In autumn and winter in northern South China, even if the cold wind sweeps away, the temperature will rise rapidly. When there is no wind on a sunny day, it is often said that "October is sunny and there is no wind to warm". Due to the influence of global warming, winter here usually comes in 65438+February. South China, Taiwan Province Province and Hainan Island to the south, 165438+ 10 has not yet entered winter. However, the temperature in June 5438+065438+ 10 is not very high, and the highest temperature is generally below 30℃. In addition, it is not excluded that there is a strong cooling due to the influence of strong cold air, but it is rare in recent years.

165438+ 10 In normal years, the first frost will appear in the Qinling Mountains in the north, the western and southern parts of Huanghuai, and the northern part of Jiangnan in the south. In the cold year165438+1mid-October, the first frost will also appear north of Nanling. 165438+ 10 In the north of October, as the front of cold air moved out of the field, the cold air mass behind the front began to change to the warmer side. If there is no follow-up cold air supplement, after a few days, although the temperature rises, the air quality gradually deteriorates. Especially in big cities, the water vapor accumulated in the atmosphere combines with pollution particles to form smog or dense fog, which affects people's health and traffic operation. Water vapor conditions in the southwest and south are better than those in the north. If the temperature is low in the morning, there are often patches of fog.

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After 1 1 month, the precipitation in all parts of the country decreased obviously. The snow on the plateau snow-capped mountains no longer melts. The first snow often appears in North China and other places, while the first snow in Beijing is difficult to predict and has great influence, so it often needs special attention. At this time, the forms of precipitation are diversified: rain, snow, sleet, graupel, ice particles and so on. When there is strong cold air, it will snow in Jiangnan. The typical continuous rain in West China in Southwest China has ended, but compared with the situation of little rain in the whole country, it is still a rainy place. According to the time distribution of precipitation in southwest China, 165438+ 10 entered the dry season of the year. The characteristics of dry season in southwest and northwest are more obvious. The rainfall in Sichuan Basin, eastern Guizhou and southwestern Yunnan in June 5438+065438+ 10 exceeded 50 mm. In Yunnan, sunny days are warm, rainy days are cold, and there is a saying that "the four seasons are like spring and it rains in winter". If there is strong cold air invasion and warm and humid air flow echoes, the process rainfall in the southern region will be greater. At this time, the rainy days and rainfall in Jiangbei and South China are less and less than those in Jiangnan. For South China where crops are harvested three times a year, the drought in June 165438+ 10 still has a negative impact on crop growth.

With the strengthening of cold air, the cooling range changes obviously and the cooling trend accelerates. People are used to the coolness in the north. Since the end of 10, heating has been provided one after another, and people have shelter from the cold. For people in the middle and lower reaches of the Yangtze River in late autumn, the average temperature is generally 12℃ to 15℃. The rain has stopped in Mao Mao. If you encounter strong cold air and move south quickly, sometimes in less than a day, the temperature can be close to 8- 10℃, or even more. But after all, after the gale, the sun shines, the cold air mass degrades rapidly, and the temperature rises rapidly. The rise of temperature and the accumulation of heat prompted the next round of cold air to bring a strong cooling. At this time, the pleasant late autumn weather is coming to an end, and the obvious cooling makes this area enter the first frost period and the best viewing period of red leaves, and 1 1 enters the winter at the end of the year.

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