Abstract:In the summer of 2023, the overall climate of China was characterized by high temperature with less rainfall, and the regional and periodic high temperature, droughts, floods and other meteorological disasters occurred frequently. The precipitation displayed remarkable spatial differences across China, with the major rain belt mainly located in northern China. Both the Songhua River Basin and the Haihe River Basin experienced severe flash flooding in middle summer. Both the generated typhoons and the landfall typhoons were less than in the same period in years, but the northward typhoons incurred extremely serious flood disasters in the Beijing-Tianjin-Hebei Region. The national summer temperature ranked the second highest since 1961, especially in northern China. Both North China and Northwest China experienced the most intense heat waves. The anomalous excessive precipitation in North China and Northeast China was caused by different circulation systems. For the former, it was mainly caused by a rarely-seen extreme precipitation process from the end of July to early August, during which the strong moisture transport by Typhoon Doksuri and Typhoon Khanun was blocked by a much more westward and northward western Pacific subtropical high combined with the topographic effect of the Taihang Mountains; for the latter, the exceptional southerly water vapor transport in the whole troposphere along the east of Northeast China can be regarded as the direct cause. This abnormal circulation was possibly associated with the decrease in the sea ice concentration in the Barents Sea in early summer and the abnormal warmer sea surface temperature in the Northwest Pacific in middle summer.