Why doesn't it rain around Zigong?

Zigong is located in the southeast of Sichuan basin, and it is difficult to form rain clouds in geographical conditions, so there is less rain in Zigong all year round. According to the weather forecast, Zigong is located in the southeast of Sichuan Basin, and the air circulation and air pressure flow are always poor, making it difficult to form rain clouds. Therefore, there is little rain in Zigong all the year round, which is easy to cause drought.