What is the main reason for the strong sunshine in Xining?

The main reason for the strong sunshine in Xining is that it is located in the temperate zone and has strong solar radiation. In addition, there are not many suspended particles in the air, so when there are no clouds, we can better face the sun and make the sun radiate more strongly. According to relevant public information, Xining belongs to temperate zone, located near the Qinghai-Tibet Plateau, with mild climate, rainy autumn and winter, dry summer, and annual sunshine of more than 3,000 hours. It is the longest sunshine area in China, and is called the Sun City of China.