Precipitation Regions of Iran

In this paper 366 daily isohyet maps of Iran were created using Kriging method. Mean daily precipitation data for 333 synoptic stations has been used. Spatial resolution of these maps was 18Km*18Km. So 5214 pixels cover the country and temporal and spatial behavior of precipitation could be represented by a 5214*366 matrix. A cluster analysis applied on this matrix and eight different precipitation regions detected. The spatial configuration of these regions showed that amount of precipitation more or less depends to the topography but its timing is mainly controlled by regression and transgression of synoptic systems.