Climatic Characteristics of Four Seasons in Hezuo City, Gannan Prefecture, Gansu Province

Cooperative cities are cold and wet, with long cold season and short warm season. The annual average temperature is -0.5℃ to 3.5℃, the extreme maximum temperature is 28℃, and the extreme minimum temperature is -23℃. The average annual precipitation is 545 mm, concentrated in July, August and September. The average frost-free period in the cooperation zone is 48 days, and the main natural disasters are frost, hail and rain. There is plenty of sunshine all year round, and the solar energy utilization rate is high. The surface runoff is 200-350 mm deep, the annual evaporation is 1222 mm, and natural disasters are frequent, mainly including frost, cold wave, strong cooling, heavy snow, hail and autumn flood.