There will be a long period of continuous rain in Shaanxi every August. What is the reason?

This is related to the passage of rain belts in China.

First of all, the rain belt is in South China (Guangzhou, Fujian) in April and May.

In June, it arrived in the middle and lower reaches of the Yangtze River, which resulted in mildewy and rainy weather in this area.

Continue northward in July and August, reaching 35 degrees north latitude, including the North China Plain and most parts of Shaanxi.

The rain belt reached the northeast of China in September.

In addition, the formation of this rain belt is not the simple meeting of cold and warm fronts mentioned upstairs, but related to the subtropical high. In the winter before the rainy season, the subtropical high stays in the ocean, and then its power will increase and gradually move northward to Chinese mainland. Yes, the movement of this rain belt is the movement of the subtropical high.