Abstract:The main characteristics of the general atmospheric circulation in June 2018 are listed as follows. The polar vortex took the shape of a single pole in the Northern Hemisphere, stronger than in the normal years. In the mid high latitudes of Asia, the circulation presented a two troughs and one ridge pattern, and the troughs and ridge were stronger than their climatological means. The subtropical high lay eastwards obviously, and its intensity was a little stronger than its average state during the corresponding time of the normal years. The South China Sea monsoon bursted in the second pentad of June, three pentads later than usual. Also the strength of monsoon trough was weaker than in normal years. Meanwhile, monthly mean precipitation amount was 92.9 mm, which is 6% less than the normal (99.3 mm). Monthly mean temperature was 20.9℃, 0.9℃ higher than its climatological mean (20.0℃). There were four regional rainfall events during this month. Three tropical cyclones were active over the Northwest Pacific Ocean and the South China Sea, and the Fourth Typhoon “Ewiniar” landed in China for three times. Drought condition continued in Inner Mongolia, Liaoning and the north of Hebei Province. Extreme high temperature weather hit the Beijing Tianjin Hebei Region in late June. Many cities suffered from blustery weather and hailstorm.