Panzhihua has various climate types of the south subtropical zone to the north temperate zone, which is known as ‘a three-dimensional climate based on the south subtropical zone’, featuring long summer, indistinct four seasons, distinct dry and rainy seasons, large difference in temperature between day and night, arid climate, concentrated rainfall, long duration of sunshine, intense solar radiation, strong evaporation, and complicated and diversified microclimate. The annual average temperature of Panzhihua is the highest in Sichuan Province. It has a frost-free period of more than 300 days in a year