The climate of Rajasthan can be neatly divided into four different seasons:
Pre-monsoon, which extends from April to June, is the hottest season, with temperatures ranging from 32 degree Celsius to 45 degree Celsius. There is little relief from the scorching onslaught of the heat, particularly in the arid zone to the west and north-west of the Aravalli range, where temperatures often climb above 45 degree Celsius, particularly in May and June. Mt Abu registers the lowest temperatures at this time.In the desert regions the temperature rises as night falls. Prevailing winds are from the west ends and carry dust storms.
The monsoon is a welcome arrival in late June in the eastern regions of the state, falling in mid-July in the desert zones.
The fourth season, and the one of the most interest to visitors, is the winter, or cold season, which extends from December to March. January is the coolest month of the year.