Climate of Rajasthan :

Rajasthan lies to the north west of India, just above the Tropic of Cancer. The climate of Rajasthan greatly varies throughout the state. In the west, Rajasthan is relatively dry and infertile; this area includes some of the Thar Desert, also known as the Great Indian Desert. The Aravalli Hill ranges tower over the Thar Desert.

The climate of Rajasthan keeps varying throughout the state. In the desert areas, it is usually hot and dry in summer and cold during the winters. Coming to the Aravali range, to the west, both rainfall and humidity are low. While to the east, weather can be characterized by high humidity and better rainfall.

The climate of Rajasthan can be divided into four seasons: Summers, Monsoon, Post-Monsoon and winter.

Summer (April to June) : 

Summer A summer, which extends from April to June, is the hottest season, with temperatures ranging from 32 degree C to 45 degree C. In western Rajasthan the temp may rise to 48 degree C, particularly in May and June. At this time, Rajasthan's only hill station, Mt Abu registers the lowest temperatures. In the desert regions, the temperature drops at night. Prevailing winds are from the west and sometimes carry dust storms (we call them aandhi or Loo ).

Monsoon (Late June to September) :

The second season Monsoon extends from Late June to September, temp drops, but humidity increases, even when there is slight drop in the temp (35 degree C to 40 degree C). 90% of rains occur during this period.

Post Monsoon (October to November) :

The Post-monsoon period is from October to November. The average maximum temperature is 33 degree C to 38 degree C, and the minimum is between 18 degree C and 20 degree C.

Winter (December to March) :

The fourth season is Winter or the cold season, from December to March. There is a marked variation in maximum and minimum temperatures, and regional variations across the state. January is the coolest month of the year. And temp may drop to 0 degree C in some cities of Rajasthan, like Churu. There is slight precipitation in the north and northeastern region of the state, and light winds, predominantly from the north and northeast. At this time, relative humidity ranges from 50% to 60% in the morning, and 25% to 35% in the afternoon.

Rainfall in Rajasthan :

Like the climate, rainfall also keeps varying throughout the state of Rajasthan. Most of the rainfall is received from the South west monsoon in the period from July to September. The average number of rainy days usually varies from 6 to 42 depending on the dryness of the area. The average annual rainfall ranges between 200-400 mm and it is as low as 150 mm in extreme dry zones. In the south eastern part of Rajasthan, rainfall is as high as 1000mm. There are some parts in western Rajasthan which receive very little rain and on an average; it is only 100 mm per year. The Aravalli range receives high rainfall and low temperature throughout the year.

The presence of the desert in state makes the summer days very hot and nights very cold. Nighttime temperatures in winters can reach -1°C, as happened recently in Churu district in north Rajasthan. Jaisalmer and Barmer districts also lie in the western Rajasthan, and every winter tourists flock to these districts to take camel rides on the shifting sand dunes. Jaisalmer is known for its peculiar yellow sandstone, which was used to construct the "golden" Jaisalmer Fort. The maximum daytime temperatures in summers can reach 45°C. However, winters in Rajasthan are more or less pleasant.