Climate

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The Climate of the district is generally temperate. It varies greatly from tropical to severe cold depending upon the altitude of the area. The district being hilly, temperature variations due to difference in elevation are considerable. In the hilly regions, the summer is pleasant, but in the Doon, the heat is often intense, although not to such degree as in the plains of the adjoining district. The temperature drops below freezing point not only at high altitude but even at places like Dehradun during the winters, when the higher peaks are also under snow. The area receives an average annual rainfall of 2073.3 mm. Most of the annual rainfall in the district is received during the months from June to September, July and August being rainiest. Climate Data of Doon Valley for all the months is as under on the basis of mean of last 25 years

Month Rainfall
(mm)
Relative Humidity
(%)
Temperature Mean
    Max Min  Avg 
January 46.9 91 19.3 3.6 10.9
February 54.9 83 22.4 5.6 13.3
March 52.4 69 26.2 9.1 17.5
April 21.2 53 32 13.3 22.7
May 54.2 49 35.3 16.8 25.4
June 230.2 65 34.4 29.4 27.1
July 630.7 86 30.5 22.6 25.1
August 627.4 89 29.7 22.3 25.3
September 261.4 83 29.8 19.7 24.2
October 32.0 74 28.5 13.3 20.5
November 10.9 82 24.8 7.6 15.7
December 2.8 89 21.9 4.0 12.0
Average Annual 2051.4 76 27.8 13.3 20.0