Rainy season

Rainy season

    In the early summer, there is often a long period of gloomy and rainy weather in the Jianghuai Basin. At this time, the utensils are prone to mildew, so it is also called "mold rain", or "mold" for short; it is also called "meiyu" or "yellow plum rain" when Jiangnan plums are ripe. There are many records in Chinese historical records. For example, "Beginner's Notes" quoted the Southern Dynasties Emperor Liang Yuan's "Compilation Yao" "Plums are ripe and rain is called Meiyu". Tang Liu Zongyuan's "The Rain of the Rain": "The plum is welcoming the rain, and the boundlessness is late spring." etc. The Chinese almanac records the beginning and end of a mildew rain: the day when it begins is called "mould", and the day when it ends is called "mould out." The first three days after the awn planting, the mold enters the mold, and the first day after the summer, the mold does not appear. Mold enters between June 6-15, and mold emerges between July 8-19. Eastern China has an obvious rainy season with long rains and relatively concentrated rainfall. The main rain is generally east-west. The north-south displacement of the belt is a unique phenomenon during the transition of the East Asian atmospheric circulation at the turn of spring and summer. After mid-June, the rain belt remains in the Jianghuai River Basin, which is Meiyu. The staying time of the rain belt is called "the rainy season", the day at the beginning of the rainy season is called "in the plum", and the day at the end is called the "out of plum".

    In addition, because the air humidity during this period is very high, all things are easy to get wet and mildew, so people gave Meiyu an alias called "mould rain." Ming Metabolism in Hangzhou’s "Five Miscellaneous Torches•Tian Bu Yi" described: "In the south of the Yangtze River every year in March and April, there is no end to bitter rain, all kinds of molds and rot, commonly known as the plum rain, when the plum is green and yellow. Since Xu Xu Huai and the north are often dry in spring and summer. At the turn of June and July, the rain will not stop, and things will start to become mildew." In the Compendium of Materia Medica, Li Shizhen, an outstanding medical scientist in the Ming Dynasty, pointed out more clearly: "The plum rain or mildew rain, saying that it will be covered with clothes and things, and black mold will appear."