The state of Himachal Pradesh is divided into four agro climatic zones viz, Shivalik Zone, Mid-Hill Zone, High hill zone, Trans Himalayan zone ranging from up to 200m in valley areas to 3600 m in Lahaul-Spiti and Kinnaur. The climatic conditions are sub-tropical to Dry and extremely cold conditions. The average rainfall ranges from 500mm in Trans Himalayan zone to upto 3000mm in mid hill zone. The cultivated areas are naturally high in the valley with 55% and least at Trans himalayan zone at 5%. Due to extreme variation in elevation, great variation occurs in the climatic conditions of Himachal. The climate varies from hot and subhumid tropical in the southern tracts to, with more elevation, cold, alpine, and glacial in the northern and eastern mountain ranges. The state has areas like Dharamsalathat receive very heavy rainfall, as well as those like Lahaul and Spitithat are cold and almost rainless.