Xinjiang, the most northwestern region in China, has conspicuous continental climate, with highly changeable temperature, sharp difference in temperature between day and night, abundant sunshine, intense evaporation and little precipitation. The contrast of climate in northern and southern Xinjiang, divided by the Tianshan Mountains, is also very obvious. The mean annual temperature of northern Xinjiang where Urumqi located is 4C-8C (33F-46.4F) and that of southern Xinjiang 9C-12C (48.2F-55.6F).