Abstract:The main characteristics of atmospheric circulation in July 2024 are shown as follows. The polar vortex in the Northern Hemisphere was distributed around the Arctic Pole, which was stronger than normal. The Northwest Pacific subtropical high was stronger than normal, located more westward and northward. The national average precipitation in July was 139.9 mm, 15% more than normal, ranking the third most since 1961. The daily precipitation at 33 national stations reached or surpassed the historical extreme values. There were seven regional rainstorm processes in this month. Influenced by the Super Typhoon Gaemi and the residual circulations, extreme heavy rainstorms occurred in Taiwan, northeastern Fujian, eastern Guangdong, eastern and southern Hunan from 24 to 28 July in order. Two typhoons were generated in total, less than normal in July. The national average temperature (23.2℃) was higher than normal by 1.0℃, being the highest value in July since 1961. The average monthly temperature in most parts of Zhejiang, southern Jiangsu, northwestern Jiangxi and central Hunan was 2-4℃ higher than normal. A continuous high temperature process occurred, during which the daily maximum temperature at 53 national stations in southern China reached or surpassed historical records. High temperature days were obviously more than normal, and the number of high temperature days in the region south of Yangtze River was more than 25 days.