Why is Liupanshui in Guizhou called Du Liang?

Experts from China Academy of Sciences, State Environmental Protection Administration and China Meteorological Bureau made a scientific analysis of the summer climate characteristics in Liupanshui City, Guizhou Province through observation and detection experiments. They think that the summer here is "cool and comfortable, moist and fresh, with moderate ultraviolet rays", which is unique and can be called "the cool capital of China".

Liupanshui is located at the intersection of water vapor circulation in the Bay of Bengal, cold air circulation in Siberia and subtropical high circulation in the Pacific Ocean, with abundant rainfall and suitable temperature. Although it is located in the plateau above 1800 meters above sea level, the ultraviolet radiation is weakened by the atmospheric clouds with a thickness of 1000 meters and a humidity of 70%, which makes the ultraviolet radiation milder.

The unique geographical location makes Liupanshui's climate cool, with no summer all year round and spring and autumn connected. By searching the observation data of more than 730 weather stations in China and comparing them with the national 17 summer resorts, experts found that Liupanshui is obviously superior in human comfort. The average temperature in summer is less than 20℃, and the average temperatures in June, July and August are 18.3℃, 19.8℃ and 19.2 respectively. I feel comfortable 96% of the time in summer, 9 1 day during the day and 89 days at night.