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What is the beginning of winter? What are the weather changes

DailyBird Culture 2021-10-09 1 0

Lidong is one of the 24 solar terms. In addition to the cold weather, there are other weather changes. What is Lidong? What are the weather changes at the beginning of winter? Next, let's follow the old yellow calendar of this issue and have a look!

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is one of the twenty-four solar terms. The Dou refers to the beginning of winter in the northwest, and the sun yellow meridian is 225 °, which is the festival between November 7 and 8 of the Gregorian calendar. Lidong is a seasonal solar term. Lidong means that winter begins from now on. After the beginning of winter, the sunshine time will continue to shorten and the noon sun height will continue to decrease. Lidong was one of the folk "four seasons and eight Festivals" in ancient society. People generally held sacrificial activities. Lidong is not only the first season of winter, but also an important festival in many parts of China in ancient times.


what are the weather changes at the beginning of winter? According to statistics, on average, 2-3 tropical cyclones are generated in November every year. Especially the cyclones generated in the Northwest Pacific may develop to typhoon intensity. In the past 55 years, 11 Tropical Cyclones Landed along the coast of China in November, mainly in Taiwan, Guangdong and Hainan. If the zonal circulation prevails in the middle latitude in that year, the tropical cyclone is more active. If the meridional circulation prevails in the middle latitude, that is, the cold air is strong, it is not easy to have a typhoon.

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in northern South China during the beginning of winter in autumn and summer? Even if the cold wind sweeps, the temperature will rise rapidly. When it is sunny and windless, it is often said that "there is little sunshine in October and spring, windless and warm". Due to the impact of global warming, winter will not enter here until December. Southern South China, Taiwan and Hainan Island in the South have not yet entered winter in November. However, the temperature in November is not very high, and the maximum temperature is generally below 30 ℃. In addition, it is not ruled out that strong cooling occurs due to the influence of strong cold air, but it has rarely occurred in recent years.


are prone to frost and fog in late winter and autumn. In November of normal years, early frost will appear one after another from the north of Qinling Mountains, the West and south of Huanghuai River and the south to the north of Jiangnan river. In cold years, early frost will also appear in the north of Nanling in mid November. In the north in November, as the cold air front moved out of the local area, the cold air mass behind the front began to change to the warm side. If there was no subsequent cold air supplement, the temperature picked up a few days later, but the air quality gradually deteriorated. Especially in big cities, the accumulated water vapor and pollution particles in the atmosphere combine and condense to form smoke or dense fog, which affects people's health and traffic operation. In the southwest and Jiangnan of China, the water vapor condition is better than that in the north. If the temperature is low in the morning, there are often heavy fog.


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the early snow precipitation in North China is diverse. After November, the precipitation all over the country has decreased significantly. The snow on the snowy mountains on the plateau is no longer melting. The first snow often appears in North China and other places. The first snow in Beijing is difficult to predict and has a great impact, which often needs special attention. At this time, the forms of precipitation are diversified: rain, snow, sleet, graupel, ice particles, etc. When there is strong cold air, it will snow in Jiangnan. The typical rainy season in Western China in Southwest China ends, but it is still a place with more rain than the situation in China. According to the time distribution of precipitation in Southwest China, November enters the dry season of the year. The characteristics of dry season in southwest and northwest are more obvious. In Sichuan Basin, eastern Guizhou and Southwest Yunnan, there is more than 50mm rainfall in November. In Yunnan, sunny days are warm and rainy days are cloudy and cold. There is a saying that "four seasons are like spring and one rain is winter". In case of strong cold air intrusion and warm and humid air flow, the process rainfall in the South will be large. At this time, the rainy days and rainfall in the north of the Yangtze River and South China are less and less than those in the south of the Yangtze River. For South China with three crops a year, the drought in November still has a negative impact on crop growth. The temperature of


decreased significantly. With the strengthening of cold air, the trend of temperature decline accelerated. People are used to the cooling in the north. Since late October, heating has been carried out successively. Fortunately, people still have a cold shelter. For people in the middle and lower reaches of the Yangtze River in late autumn, the average temperature is generally 12 ℃ to 15 ℃. The continuous rain has ended. If strong cold air is encountered, it will quickly go south. Sometimes, the temperature can drop close to 8-10 ℃ or more in less than a day. But after all, after the strong wind, the sun shines, the air-conditioning mass changes quickly, and the temperature rises rapidly. The rise of temperature and the accumulation of heat promote the next round of cold air to bring strong cooling. At this time, the pleasant late autumn weather is coming to an end, and the obvious cooling makes this area enter the best viewing period of red leaves while entering the initial frost period, and enter winter one after another at the end of November.


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