When does the plum rain season arrive in Jiangsu?

(1) Normal plum rain: The normal plum rain in the middle and lower reaches of the Yangtze River begins in mid-June and ends in mid-July, which occurs during the two solar terms of "Grass Zhong" and "Summer Solstice". The Meiyu period lasts about 20-30 days, with rainfall ranging from 200-400 mm. Starting around "Small Heat", the main rainfall belt moves northward to the Yellow River and Huaihe River basins, and then to Shandong and North China. The weather in the Yangtze River Basin has begun to change from rainy, hot and humid weather to sunny and hot midsummer. According to statistics, this type of normal plum rain accounts for about half of the total. (2) Early plum rain: In some years, the plum rain starts very early, arriving suddenly at the end of May or early June. Meteorologically speaking, the plum rains that start before the "grain" are usually collectively referred to as "early plum rains". Early plum rains will bring some abnormal phenomena. For example, during the period when the plum rain has just begun, cold air from the north to the south is still very frequent in the atmosphere close to the ground. Therefore, after the rain begins, the temperature is still relatively low and even feels chilly. The farmer's proverb says: " This is what it means if you eat Dragon Boat Festival brown rice, you have to freeze it for three times. At the same time, there is no obvious moisture phenomenon. Farmers in some areas of the middle and lower reaches of the Yangtze River call the relatively low-temperature yellow plum rain in this section "cold water yellow plum rain". In the future, as the rainy season lasts longer and the warm and humid air intensifies, the temperature will gradually rise, the humidity will continue to increase, and the inherent characteristics of plum rain will become more and more obvious. The chance of early plum rains is roughly once every ten years. This early plum rain often presents two situations. One type starts early and ends late, and even ends in late July. The rainy period lasts forty to fifty days, and in some years it lasts for two months. The other is that it starts early and ends early. By late June, the middle and lower reaches of the Yangtze River have entered midsummer. Due to the early arrival of midsummer, droughts of varying degrees in the middle and lower reaches of the Yangtze River are often caused. (3) Late Meiyu: The opposite of early Meiyu is belated Meiyu. Meteorologically, the Meiyu that starts after late June is usually called late Meiyu. There are more chances of late plum rains than early plum rains. Since the solar term is relatively late when the Late Meiyu Rain begins, once the warm and humid air moves northward, it is very powerful. At the same time, the solar radiation is also relatively strong. After the air is heated, intense convection is prone to occur. Therefore, the Late Meiyu Rain is often accompanied by thunderstorms and showers. People also call this yellow plum rain "the first yellow plum rain". The duration of late plum rain is generally not long, only about half a month on average. However, the rainfall during this rainy season is sometimes quite concentrated.