Gangtok has a subtropical highland climate, highly influenced by the monsoons. Located at an altitude of 1676 meters above sea level, the place experiences a mild, temperate climate, and remains conformable throughout the year. During the year, Gangtok passes though five distinctive seasons: summer, monsoons, autumn, winter and spring.
The temperature in Gangtok ranges between an average maximum of 22° Celsius during summer and an average minimum of 4° Celsius during winter. The average annual temperature is a comfortable 18° Celsius approximately during the year.
Summer in Gangtok is from April-end to June. The weather during this time is mild with the average temperature ranging from a maximum of 22° Celsius and a minimum of 13° Celsius. In fact, the summer temperature rarely crosses 25° Celsius and summers are quite pleasant here.
Monsoon starts around June and continues till around September. During this time Gangtok experiences heavy downpour with the rains often causing heavy landslides. Gangtok registers an average of 3890 mm of rainfall annually annum and is known to receive highest rainfall in the region.
Autumn in Gangtok stays as long as two months for September to October. During this time the temperature is comfortable and the weather gets less humid owning to the receding monsoon.
Winter here starts around the month of November and continues till around early March. The winters here are characterized by foggy chilly mornings and cold nights. The average winter temperature is between 4° Celsius and 7° Celsius. Though snowfall here is rare now-a-days, it does get quite chilly during December and January with the temperature dipping to around 1° Celsius.
The months from March to May, which is typically spring time, are quite sunny and warm.
The best season to visit Gangtok is during autumn and spring time when the weather is ideal for sightseeing. Even summer is pleasant and is popular among tourists looking to escape the summer heat.