What is the coldest city in China?

I'm curious, can you tell me what the coldest city in China is? I've heard that some parts of the country experience bitterly cold winters, but I'm not sure which city specifically holds the title of being the coldest. Is it a city located in the far north, perhaps close to the border with Russia? Or could it be a city nestled in the high altitudes of the Tibetan Plateau? I'm eager to learn more about this fascinating topic.