The summer rainfall of Northwest China is most significantly correlated with the water vapor amount over Iranian Plateau and between the Equatorial Eastern Indian Ocean and the Equatorial Eastern Pacific.

• 西北地区夏季降水和西北地区西部哈萨克斯坦地区以及赤道东印度洋和赤道西太平洋交汇处的大气水汽含量相关最为显著。