Today (November 22nd), China is experiencing a light snow season. The rainbow is hidden and closed into winter. The light snow solar term is the second solar term in winter, meaning that the weather is getting colder and snowfall is spreading day by day. China Weather Network has launched a map of early snow during the light snow period to see where the first snow of winter will be welcomed. The first snowfall season in winter is approaching in the Yellow and Huaihe regions of North China. Winter has arrived, and it is time to look forward to the arrival of the first snowfall once a year. The "Explanation of the Seventy Two Seasons of the Moon Order" states: "In October, when rain falls, it becomes thin with cold air, so it condenses into snow. It is said that the small ones do not flourish." The arrival of the Little Snow solar term means that the form of precipitation will change from rain to snow, but the amount of snow is not enough, so it is called Little Snow. From the National First Snow Map released by China Weather Network during the Light Snow Festival, it can be seen that the North China and Huanghuai regions often experience first snow during the light snow season. In large cities, Beijing, Tianjin, Shijiazhuang, Taiyuan, Jinan, Zhengzhou, Xi'an, and other places often experience the first snowfall of winter during this season. For the middle and lower reaches of the Yangtze River, the temperature during the perennial light snow season is not low enough, so the precipitation phase is still mainly rainfall, and it is generally not until the heavy snow season that the first snow arrives. China has a vast territory and there are significant differences in the timing of first snowfall in various regions. Most areas in Northeast and Northwest China usually experience snowfall before the light snow season. Places such as Xinjiang, Qinghai Tibet Plateau, and Northeast China have already entered the peak period of snowfall during the light snow season, and it is necessary to be vigilant against the potential disasters caused by strong winds and snow. In most parts of the south, snow usually only appears after mid December, while in southern China, whether or not snow can be seen throughout the year depends on luck. 【 Light Snow Weather 】 The cold weather converges all things of snow. The light snow solar term reflects the trend of temperature and precipitation changes. At this time, cold waves and cold air activities become more frequent, the chill becomes stronger, and snowfall increases. Snow "is a product of cold weather, while" light snow "vividly represents the weather characteristics of" the climate is not deep enough and the precipitation is not heavy "during this solar term. The arrival of the Little Snow Festival means that the form of precipitation will change from rain to snow. Throughout the year, the North China and Huanghuai regions experience first snow during the light snow season, while most areas in Northeast and Northwest China already experience heavy snowfall before the light snow season. Snowflakes fall and everything converges. At this moment, the alternation of the four seasons has also arrived at the last stop. During the light snow season, China's winter territory continued to expand southward from the Huanghuai region, and the Jiangnan region began the process of entering winter. At the end of the light snow solar term, the winter front usually crosses the Yangtze River and reaches near the Nanling Mountain. During the season of light snow, there is often a large-scale southward movement of cold air, bringing widespread strong winds and cooling weather. According to statistics from China Weather Network, the national average temperature during the autumn and winter seasons from 1991 to 2020 shows that during the light snow season, the national average temperature fell below freezing point for the first time in the second half of the year, dropping directly from 3.4 ℃ in the beginning of winter to -0.1 ℃, and the chill gradually deepened. 【 Snowy phenology 】 Small snow is sealed off and blocked into winter. Small snow can be divided into three stages: one stage is when the rainbow is hidden; The weather in the second season rises, and the earth's atmosphere decreases; Three blocked seasons lead to winter. At this point, the rainbow no longer appears, the yang qi in the air rises, the yin qi on the ground drops, and the heaven and earth are closed, entering a cold winter. At this time, the northern region is already under "small snow cover", and it is necessary to do a good job of livestock control