Climate & Rainfall  in Dehradun District

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 Relative Humidity Temperature   (mm) (%) Max Min Ave. 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