In this study, the authors identify a decadal decrease in May precipitation over Yunnan, China, after 2009. Based on observed data from meteorological stations, the area‐average precipitation in May over Yunnan has decreased from 135 mm during the period 1999–2008 to 83 mm during the period 2009–2019. The decline in precipitation is particularly pronounced in the southwestern and central regions of Yunnan, where it exceeds 100...