What month is the rainy season

The rainy season is April and May, as shown in the following figure:

In the middle and lower reaches of the Yangtze River in China, Taiwan Province Province, south-central Japan and south Korea, there are continuous rainy days in April and May every year. Because it is the mature period of plums in Jiangnan, it is called "Meiyu", and this period is called Meiyu 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 began to be dominated by the Pacific subtropical high and officially entered the hot summer.