By means of ground meteorological data from 1931 to 2002, the climatic tendencies of annual and monthly mean temperature, maximal and minimal temperature in the Wuhan region were analyzed. A statistic analysis was made of foggy days, fog formation and dissipation, and the correlated meteorological factors. The regularities of annual and monthly fog variation, fog formation and dissipation, and fog intensity were discussed. The annual mean temperature and foggy days of Wuhan were analyzed using the wavelet analysis technique. The results indicate that there were opposite inter-decade variation characteristics between foggy days and annual mean temperature