Which city in China has the lowest summer temperature?

The lowest temperature in summer is in Bijie, Guizhou.

The Bijie area is the roof of the Guizhou Plateau and the coolest place in Guizhou. It belongs to the warm-humid monsoon climate zone and is located at low latitude and high altitude. The highest altitude is 2,900 meters and the lowest altitude is 475 meters. In winter, There is no severe cold or scorching heat in summer. In the hottest midsummer, the average temperature in the entire region is only 22°C (21°C in Zhijin Cave and 17.7°C in Weining Caohai), making it a truly cool world;

Especially the Weining Plateau, where you can relax on the lakeside and the Zouma Grassland, is 2-3°C cooler than Liupanshui, which is known as the "Liangdu". Bijie is a "summer paradise" in the scorching summer.