Why is there plum rain in Shanghai, which is divided into several months?

Meiyu, also known as Huangmeitian, refers to a cloudy and rainy natural climate phenomenon in the middle and lower reaches of the Yangtze River, Taiwan Province Province, south-central Japan and south Korea every year from the middle and late June to the first half of July. Because plum rains occurred in the mature period of plums in the south of the Yangtze River, people in China call this climate phenomenon "plum rains", and this period is also called "plum rains season". In the rainy season, the air humidity is high and the temperature is high, so clothes are easy to get moldy, so some people call the rainy season "moldy rain". After the rainy season, the weather in Central China, South China, Taiwan Province Province and other places began to be dominated by the Pacific subtropical high, and officially entered the summer heat.

Be distributed

Meiyu mainly occurs in the middle and lower reaches of the Yangtze River in China, Taiwan Province Province in the subtropical monsoon climate zone, the southernmost tip of the Korean Peninsula and south-central Japan. There is no plum rain in other parts of the world at the same latitude. There is no obvious plum rain in South China.

The reason for editing this paragraph

Every year from late May to early June, cold air from the north and warm air from the south meet in South China, forming a quasi-static front in South China. By the end of June, the influence of warm air was strengthened, and the quasi-static front moved northward to Jianghuai area, becoming the quasi-static front of Jianghuai (also known as Meiyu front). Because the warm air from the south carries a lot of water vapor, when it meets the cold air mass, it will produce a lot of convection activities. Because the cold and warm air forces are similar during this period, the front stays in the Jianghuai area.