We conducted vegetation surveys of semi-natural grasslands, which were maintained by periodic mowing, on the levee slopes of traditional terraced paddy fields in Hyogo Prefecture to examine the regional differences in species composition and richness of such grasslands and to analyze the relationships between climatic conditions and those attributes. In this study, the area of the prefecture was divided into the northern region, southern region, and Awaji Island. A total of 382 grassland stands in the three regions were investigated. The species composition of the stands was analyzed using the phytosociological tabulation method. The stands were divided into three community types:A, B, and C. Types A and C were found only in the northern and southern regions, respectively. Type B was distributed mainly in the southern region and Awaji Island. The results of the detrended correspondence analysis （DCA） showed that the species composition differed among the three community types. Stand scores on the first DCA axis were strongly correlated with warmth index （WI） and maximum snow depth. The numbers of native species and perennial species per quadrat （1 m²） were significantly higher in type A than in types B and C. Such attributes of species richness were also correlated with WI and maximum snow depth. These results suggest that the species composition and richness of semi-natural grasslands were affected by climatic factors such as temperature and snowfall.