The region's temperature varies widely by season. Summer temperatures reach , and winter temperatures fall to . The western Himalayas in the north and the Thar Desert in the south and southwest primarily determine the climate. The south-western monsoon brings nearly 70 percent of the annual rainfall from July to September. Most of the district has an arid (tropic) moisture regime, according to soil-classification criteria. Soil-moisture computations using the Newhall mathematical model indicate that the region has a weak aridic moisture regime (Van Wambeke, 1985).