The climate of Rajasthan varies from semi arid to arid. The mercury touches 49 degrees centigrade at some places during summer and drops below freezing point during winter.

Though the average annual rainfall ranges between 200-400 mm, it is as low as 150 mm in extreme arid zones and as high as 1000 mm in the south eastern part of the State. Most of the rainfall (60-80%) is received with the South west monsoon in the period from July to September. The average number of rainy days vary from 6 to 42 depending on the aridity of the area.