Climate

The climate ranges from sub-tropical in the south to tundra in the northern parts. Most of the inhabited regions of Sikkim, however, enjoy a temperate climate, with the temperatures seldom exceeding 28 °C (82 ° F) in summer or dropping below 0 °C (32 °F) in winter. The state enjoys five seasons: winter, summer, spring, and autumn, and a monsoon season between June and September. The average annual temperature for most of Sikkim is around 18 °C (64 °F). Sikkim is one of the few states in India to receive regular snowfall. The snowline is around 6 000 meters (19,600 feet).

During the monsoon months, the state is lashed by heavy rains that increase the number of landslides. The state record for the longest period of non-stop rain is eleven days. In the northern region, because of high altitude, temperatures drop below −40 °C in winter. Fog also affects many parts of the state during winter and the monsoons, making transportation extremely perilous.