The main characteristics of the general atmospheric circulation in October 2019 are as follows. Over the Northern Hemisphere, the polar vortex showed a dipole pattern. The circulation presented a four-wave pattern in middle-high latitudes. The western North Pacific subtropical high was distributed in the east-west direction, which was much stronger and westward than normal. The monthly mean precipitation amount was 36.6 mm, which was close to the climatological mean (35.8 mm). The monthly mean temperature was 11.1℃, 0.8℃ higher than normal (10.3℃). Two torrential rain processes occurred du-ring this month. One was led by Typhoon Mitag, and the other was caused by high-level trough and shear line. There were four cold air processes, two of which were cold-air outbreak processes and the other two were strong cold air processes. One blowing sand weather event occurred in the northern region. Typhoon Mitag landed the coast of Putuo, Zhoushan of Zhejiang Province at 20:30 BT 1 October 2019.