Dehradun’s weather is generally pleasant and ranges from tropical and hot in summers to very cold in winter, depending on altitude and location. The hilly regions close-by gets snow in winter, but the temperature has not been known to fall below 0 degrees.
The general summer temperatures range from low to mid thirties. The temperatures get very hot in the Doon valley region with lots of rainfall, making the region very fertile for planting basmati rice and litchis.
The best times to visit are between March and April or between September and October. During these times the temperature is pleasant and the rainfall not heavy.