Abstract:The main characteristic of the general atmospheric circulation in May 2022 is that the single polar vortex center in the Northern Hemisphere was stronger than usual. The circulation finished the transition from a three-wave pattern to a four-wave pattern, the 500 hPa geopotential height presented the distribution of a four-wave pattern in middle-high latitudes of the Northern Hemisphere, and the degree of meridionality was stonger than normal. The strength of Western Pacific subtropical high and the south branch trough were similar to those in normal years. The monthly mean temperature was 16.7°C, 0.2°C higher than normal. The monthly mean precipitation amount was 71.6 mm, 2% more than normal, of which the precipitation in Southwest China and South China was significantly more than in the normal year. Four regional rainfall processes occurred in China this month and several provinces were attacked by gales and hailstorm, which led to economic losses and casualties to some degrees. In addition, three cold air processes occurred this month, and the northern part of China experienced three sand-dust weather events. The drought maintained or developed in the Huanghuai and Jianghuai Regions.