Abstract: Based on the ground observation data in Hefei from1953 to 2008, the characteristics of main urban disastrous weather and their trends were analyzed by linear estimate method, including rainstorm, heavy fog, thunder and lightning, ice snow disaster, strong wind and high temperature. The results indicate that annual heavy fog days increase in Hefei during recent 56 years, especially after 1990s. Annual rainstorm days are stable, while the probability of heavy rainstorm increases after 2000. Annual strong wind days decrease, so is annual thunder and lightning days, annual high temperature days and annual snowfall days. 49.1% of annual extreme lowest air temperature occurs in the first day or the second day after snowfall.