The climate of Rajasthan can be divided into four seasons: Pre-Monsoons, Monsoon, Post-Monsoon and Winter.
Pre-monsoon, which extends from April to June, is the hottest season, with temperatures ranging from 32oC to 45oC.
The second season Monsoon extends from July to September, temp drops but humidity increases making it very un
comfortable, even when there is slight drop in the temp (35oC to 40oC). We have about 90% of our rains in this period.

Summer Season:

The summer begins in the month of March while the temperature keeps rising progressively through April, May and June. West of Rajasthan and the eastern side of Aravalli Range, in the region of Bikaner, Phalodi, Jaisalmer and Barmer, the maximum daily temperature hovers around 40°C to 45°C. Sometimes, it even reaches as high a 49°C during the summer months.
Nights of summers see a considerable temperature fall with a minimum daily temperature around 20°C to 29°C. However, Udaipur and Mount Abu, have a pleasanter climate in summers with a relatively lower daily maximum temperature that reaches 38°C and 31.5°C, respectively.

The daily minimum temperature at nights for these two stations hovers around 25°C and 22°C, respectively. The major portion of the state tat consists of the arid west and the semi-arid mid-west has an average maximum of 45°C in June.

Monsoon Season:

The second season Monsoon extends from July to September, temp drops but humidity increases making it very uncomfortable, even when there is slight drop in the temp (35°C to 40°C).

PostMonsoon Season:
The Post-monsoon period is from Oct to December. The average maximum temperature is 33oC to 38oC, and the minimum is between 18°C and 20°C.

Winter Season:
The fourth season is the winter or cold season, from January to March. There is a marked variation in maximum and minimum temperatures and regional variations across the state.