When does Huangmeitian in Shanghai start and end?

Shanghai Huangmeitian started in the middle and late June and ended in the middle and late July.

The rainy season in Shanghai is usually from mid-June to early July in the solar calendar every year. The typical plum rains in Shanghai generally enter plum blossoms from early June to mid-June, and bloom from early July to mid-July. Meiyu refers to the rainy days before plum blossom, which generally starts in mid-June and lasts for about half a month. The plum blossom time in Shanghai is always between June 6th and15, and the plum blossom time is always between July 8th and19.

There is an obvious rainy season in the eastern part of China, with a long rainy period and relatively concentrated rainfall, which is caused by the north-south displacement of the main rain belt in the east-west direction and is a unique phenomenon in the seasonal transformation of the atmospheric circulation in East Asia at the turn of spring and summer. 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.

Formation conditions of Huangmeitian:

1. There is blocking high pressure or stable high pressure ridge in the middle troposphere in high latitudes of Asia, and the atmospheric circulation is relatively stable with little change.

2. The westerly circulation in the mid-latitude area is gentle, and frequent short-wave activities provide cold air conditions for the Jianghuai area.

3. The western Pacific subtropical high has an obvious process of extending westward and jumping northward. The ridge line of the 500 HPA subtropical high is stable between 20 and 25 degrees north latitude, and the warm and humid air flow is transported from the edge of the subtropical high to the Jianghuai basin. Under this circulation condition, Meiyu front lingers in the Jianghuai basin, often accompanied by southwest vortex and shear line, and the mesoscale system on Meiyu front is active. It not only maintains the continuous precipitation during the Meiyu period, but also provides abundant water for the rainstorm.