The characteristics of the atmospheric circulation in the winter of 2024 (December 2024 - February 2025) were as follows: the polar vortex in the northern hemisphere had a dipole distribution, and the circulation in the middle and high latitudes had a 3-wave distribution. There was a significant positive anomaly in the ridge of high pressure in Siberia, and the ridge was stronger than the annual average, which was conducive to the accumulation of cold air. The East Asian large trough had a weak negative anomaly, and the trough was stronger than the annual average, which was conducive to guiding cold air southward. There were 11 gale processes of magnitude 8 or above in the offshore waters of China, including 9 gale processes of cold air, 1 gale process of cold air and extratropical cyclones, and 1 gale process of cold air and typhoon. In the winter 2024, there were 4 relatively obvious sea fog processes in the offshore waters of China. A total of one tropical cyclone was generated in the Western North Pacific and the South China Sea, and 15 tropical cyclones were generated in the rest of the world. The number of days with large waves above 2 m in the offshore waters of China was 54 days, accounting for about 60% of the total number of days in winter. In winter 2024, China offshore waters showed an obvious cooling trend, and the cooling range of the northern waters was significantly greater than that of the southern waters. The sea surface temperature of China offshore waters in December 2024 was generally higher than that of the year, while that of the year from January to February 2025 was generally lower than usual.