Owing to the influence by the several cordilleras and southwest monsoon climate , the distribution of rainfall in this area is very asymmetric . The average annual rainfall is only 300mm along the western himalayas and appears descend trend from southwest to northeast .

受各大山脉和西南季风影响，阿里降雨量分布极不均匀，沿西喜马拉雅山脉多年平均降水量仅为300mm，且自西南向东北呈递减趋势。