Shanghai, Hangzhou and Nanjing, which is the coldest in winter and the hottest in summer?

The coldest place in the northernmost part of China should be Mohe River in Heilongjiang. Mohe is a city of minus 25 degrees, especially Harbin. The furnace city with minus 16 degree is the name given by China to the city with extremely hot weather. "Three kitchens": During the Republic of China, Chongqing, Wuhan and Nanjing were famous big cities along the Yangtze River. The temperature is hot in summer, so it is called "three stoves". "Four stoves": Chongqing, Wuhan, Nanjing and Changsha, four cities with hot summer climate in the Yangtze River basin, are called "four stoves". "Seven kitchens": Chongqing, Wuhan, Nanjing, Changsha, Hangzhou, Nanchang and Shanghai, seven cities with hot summer climate, are called "seven kitchens". The saying of "stove" comes from the people, and there is no statistical basis for temperature. In recent years, in addition to the Yunnan-Guizhou Plateau, the phenomenon of high temperature in many southern cities in the latitude region of the Yangtze River basin has become prominent. In addition, Beijing, Tianjin, Shijiazhuang, An and other northern cities in the latitude region of the Yellow River have also experienced high temperature weather that is rare in history. These phenomena have aroused people's concern about the environment.