The main characteristics of the atmospheric circulation in spring (from March to May) 2018 are as follows. The polar vortex was characterized by the dipole type in the Northern Hemisphere and fourwave mode in middle and high latitudes. In March, the atmospheric circulation was in meridional pattern in middle and high latitudes of central and eastern Asia, which was favorable for the southward of the cold air. In April, the cold air was weaker. There appeared more extratropical cyclones in May. In spring, there were 15 gale processes (above 8 grade) in offshore areas of China, including 8 produced by cold air, three by cold air and extratropical cyclones, three by extratropical cyclones which moved into the sea, and two thunderstorm gale processes by severe convective storm. There were 14 rough sea wave processes above two meters. Eleven obvious sea fog processes occurred over offshore areas, including three in March, three in April, and 5 in May. Only one typhoon occurred over western North Pacific and the South China Sea. In addition, there were 14 tropical cyclones over other oceans in the world, including one over the North Atlantic, 6 over the South Pacific, 5 over the South Indian Ocean, and two over the North Indian Ocean. The sea surface temperature showed uptrend on the whole.