Where is the lowest temperature in summer and the highest temperature in winter in China?

The lowest summer temperature in China is on the Qinghai-Tibet Plateau (the altitude of the Qinghai-Tibet Plateau is more than 4,000m, and it is 6 degrees Celsius per 1000 Mi Yue, so the average summer temperature on the Qinghai-Tibet Plateau is about 0 degrees Celsius).

The highest temperature in winter is Zengmu shoal in Sansha City, Hainan Province, because it is in the tropics, like summer all year round, at about 3 58' north latitude (near the equator), and it is still about 25 degrees Celsius in winter.