Temperature: Summer (April-July): 16 °C - 36 °C.

Winter (Nov-Feb): 2°C-24 °C. Annual Mean Rainfall 2136.7 mm per annum

Dehradun has typical weather of a north Indian city: cold winters, hot summer, rainy monsoon season and a balmy spring. The winter ranges from November to March is cold, temperature touching freezing occasionally. The months of December and January are the coldest due to winter rains, coinciding with snow-fall in the nearby mountains ranges. Overall the winters are dry. The spring, lasting from March to April, are very pleasant. Almost overnight, with almost no warning, sometime in April spring leads to onset of summer months. Summer last from April-May to July, with fairly high tempertures (sometimes even higher than 40 °C). Monsoon months, ranging from July-September, are a welcome change after the hot summer as they bring the monsoon rains from Arabian Sea (south-west of Indian subcontinent). The monsoon months are extremely humid specially July and early August. A brief autumn, between September and October, leads to winter months. There are so special changes in the autumn season except for mild weather. The region around Dehradun does not experience the falling of leaves, typical of cold regions.

Most residents have noticed a change in the weather patterns in the last 2 decades, with the growth of city. As one resident narrates "The city had a wonderful climate till a few decades ago. In summer months, rain was common in the evenings, leading to cooling. Incessant tree logging has severely damaged the local ecosystem, that may be linked to change in the weather patterns and as a result summer have becomer hotter. Till few years ago, houses in Dehradun did not even need ceiling fans but the need for air-conditioners is felt to keep cool during summer months." Warmer climate has become a severe issue for Dehradun and its wildlife population. Species found specifically in that region have now become in danger of being extinct; it has already suffered the loss of one of its more exotic species. The Salari cobra population, inhabiting the northern region of Dehradun, has been decreased considerably leading to concerns about extinction.

Best Time :
The weather is very pleasant in March, April and October, November. The summer months of May and June are hot, whilst it is awfully slushy once the rains hit in end-June. It continues to rain till September. The winter months, from December to February, are wet and decidedly cold with temperatures dropping to 2 degrees centigrade.