The "light snow" in the 24 solar terms will come on the 22nd of this month. Light snow is 165438+ every year1October 22nd or 23rd. When the sun reaches 240 degrees of the yellow meridian, it is regarded as light snow, and it is also the dividing point between Scorpio and Sagittarius. There is a saying in "Twenty-four Solar Terms": "10 In the middle of June, it was raining and was blown thin by the cold, so it condensed into snow. The words of the villain are not prosperous. " During this period, the weather gradually became cold, and the average first snow period in the middle and lower reaches of the Yellow River was basically the same as the Light Snow Festival. Although it began to snow, the amount of snow was generally small, and it was frozen at night and turned around by day. If the cold air is strong and the warm and humid airflow is active, there may be heavy snow. Therefore, Dr. Zheng reminds friends that there is no necessary connection between the light snow in solar terms and the light snow in weather.
Light snow is a season that reflects weather phenomena. "Xiaoxue" is in the second half of the solar calendar 1 1 and the second half of the lunar calendar in October. There is little snow, and there is no snow on the ground. This is the original meaning of the solar term "light snow". The ancient book "Qunfangpu" says: "Light snow will snow when it is cold, and it will not even snow on the ground, and the snow is not big." In other words, due to the cold weather, the form of precipitation changed from rain to snow in the "light snow" festival, but at this time, because the ground is not very cold, the number of snows is small and the amount of snow is not large, so it is called light snow. So light snow indicates the beginning time and degree of snowfall. Light snow, like rain and Grain Rain, is a solar term that directly reflects precipitation.
From the perspective of location science, Xiaoxue is also divided into three stages:
In the light snow solar terms, the first time is the rainbow, the second time is the sky is high and the clouds are light, and the third time is blocked from entering the winter. It means: due to the drop in temperature, it is snowy below the north, no more rain, and no rain rainbow can be seen; Because of the rising of the yang in the sky and the falling of the yin in the ground, yin and yang do not meet, and heaven and earth are blocked; So heaven and earth became one, and it became a cold winter. China has a vast territory, and the "light snow" representatively reflects the climate in the middle and lower reaches of the Yellow River. At this time, the north has entered the freezing season. "There is no rain in the lotus, but there are still Ao Shuang branches in the chrysanthemum", which has already presented the scene of early winter.
During the solar term in beginning of winter, there is snow in most parts of northwest and northeast China. In the light snow solar term, it means that there will be snow in North China. If the beginning of winter solar term marks the entry of winter in most parts of northern China, the direct performance of cold air is to gradually make the temperature in these areas reach below 0℃ in the light snow solar term. We all know that precipitation will change from rain to snow only when the air temperature under clouds and clouds is lower than 0℃. Therefore, it is an indisputable fact that the temperature in light snow stage is lower than that in winter stage.
Beginning of winter solar terms basically entered winter in northern China, and in the light snow solar terms, many areas in the middle and lower reaches of the Yangtze River entered winter one after another. Although with the arrival of winter, the precipitation in the whole country has gradually dropped to the lowest point in a year, the rainfall in Jiangnan is still higher than that in Jiangbei. Even if the first snow only appeared in the middle and late June of 65438+February in this area, the rainy weather at this time gave people a feeling of wet and cold rather than cool in late autumn, which was much worse than that of people with heating conditions in dry and cold areas in the north.
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