This thesis has considered RCM (Regional Climate Data) which is 50km by 50km grid resolution and more accurate to change or to downscale the grid data in to point climate data(station data)than the Global model(GCM) which has the same grid resolution. This thesis work is possible by the help of almighty God and my family specially my sisters Kassaye, Bezu and Nigist Belay and my advisor Dr. Semu Ayalew.