As the saying goes, “there are four seasons in one mountain and different weathers in ten miles”. Due to the impact of topography, landform and atmospheric circulation, the climate of Tibet is unique, complicated and diverse. In general, the climate is cold and dry in the northwest, and warm and humid in the southeast, forming into the tropical zone, subtropical zone, plateau temperate zone, plateau sub-frozen zone, plateau cold zone, etc.
Under the control of west monsoon in winter and the southwest monsoon in summer, the boundary of dry season and the rainy season is very obvious, and the rainfall is uneven in the different area. The dry season is from December to April of the next year, and the rainy season is from May to September.