Past past These factors greatly affect the climate of each region and, in fact, are determines the climate of a region. Statistical during the years from 1991 to 2010. In the next step cluster analysis was conducted on climatic factors derived from factor analysis. Results showed that 9 factors: temperature , relative humidity, cool season rainfall, warm season rainfall, partly cloudy days, wind speed, dust, thunder storm and days with snow, with Eigen value greater from1, and totally explained 92.35 percent of data variances. Cluster analysis of the most significant and important step in this research was to determine the number of homogeneous clusters. For this reason was done by wards method. So the whole of Iran was divided into two climatic zones and determined climatic factors separating the two zones total of Iran, and then The 2 area into three zones, as well as was done at last or final step. The purpose of final step, the Step where at which stage, obtained the number of suitable climatic zones from Iran. And at any stage of ..
