How does rainfall in eastern Sichuan compare with rainfall in western Sichuan?

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Rainfall in Sichuan varies significantly between its eastern and western regions.

The eastern basin receives higher annual precipitation, measuring approximately 40 inches (1,000 mm). This area experiences a rainy season that begins in April and peaks during July and August, and it is characterized by frequent fogs, high relative humidity, and many cloudy days.1

In contrast, precipitation is lower in the west, where the average annual total is about 20 inches (500 mm). This rainfall occurs primarily during the summer and early autumn, while the winter months are marked by heavy snowfall in the mountains.1