The main characteristics of the general atmospheric circulation in November 2021 are as follows. The polar vortex in the Northern Hemisphere is significantly strong. The Eurasian mid- and high-latitude circulation had a latitudinal multi-fluctuation pattern. Cold air was extremely active. Both East Asian trough and the western Pacific subtropical high were westward and strong. The monthly mean precipitation (23.8 mm) over China was 26.7% more than normal (18.8 mm). The monthly average temperature was 2.9℃, similar to the normal years. Cold and warm temperatures fluctuate greatly during the month. There were two nationwide cold wave processes and three widespread persistent fog-haze weather processes. Among them, the cold wave weather process from 4 to 9 November had the characteristics of a wide range of influence, sharp drop in temperature, long duration of strong winds and extreme blizards in northern China, etc.