Gangtok has a relaxing, decent weather all year long.
Temperature ranges from a typical highest of 22°C in summer months all through March to June and a typical lowest of 4°C in winter months all through December to February. Severe rainfalls found in monsoon leads to landslides in this area.
Temperature conditions here fluctuate from sub-tropical in the southern lower parts to chilly deserts in the snowy north. It is also the most humid region in the entire variety of the Himalayas, simply because of its closeness to the Bay of Bengal and immediate exposure to Southern monsoon.
Rain fall is quite heavy and properly spread all through the months from May to early October. July is the wettest month in most of the places. The intensity of rain fall during South-West monsoon period reduces from south to North, although the distribution of winter rainfall is within the reverse order. Fog is really a typical characteristic within the whole state from May to September.
Biting cold is encountered at higher altitudes of 10,000 ft plus. The temperature barely rises over 15°C and quite heavy snowfall happens all through the winter season.
Winter : December to February
Spring : March to May
Monsoon : June to September