Why is Xinjiang so hot?

Due to the geographical latitude and characteristics, as well as the air quality, Xinjiang has the longest illumination time, good transparency, strong ultraviolet rays and rapid temperature rise, so the temperature difference is large. Xinjiang has a vast territory and rich resources, so it is not accurate to say that it is the hottest in Xinjiang. Turpan is the hottest in Xinjiang, because of the basin structure, surrounding desert and dry environment, which makes the hot air keep for a long time, dissipate heat fully and have high temperature, and it is the hot pole of China.