Moldy rainy days in 2020 start in late June.

The plum rain is the annual mid-June to July, China's middle and lower reaches of the Yangtze River in the region of a period of cloudy weather. At this time, objects easy to mold, so it is also known as "moldy rain", but also at the time of the yellow ripe plums in Jiangnan, so it is also known as "plum rain" or "yellow plum rain".

Weather characteristics of the rainy season:

The rainy season is characterized by continuous rain, high temperature and high humidity. After the end of the rainy season, the rain belt moves to northern China, and the Jianghuai basin enters a hot and rainy weather.

The duration of the rain band is called the "meiyu season", and the day when the season begins is called "entering meiyu" and the day when it ends is called "leaving meiyu".

The rainy season out of the plum standard:

June, July, the northern hemisphere 500mb map, 125-140E of the western Pacific subtropical high pressure ridge location, south of Zhejiang in the 23-24N, north of Zhejiang in the 24-25C, and continuous and stable in five days or more than five days.