Sikkim is a small beautiful state of India in the Eastern Himalayas with steep mountains and deep valleys. It lies between latitudes 27° 5' N to 20° 9' N and longitudes 87° 59' E to 88° 56' E. It is wedged between Nepal in the west and Bhutan in the east and China in the north and northeast. In the south it shares its Indian border with the state of West Bengal.
Summers are extremely humid though not necessarily hot as temperatures vary according to altitude. In the lower and middle hills (Gangtok, Darjeeling, Kalimpong) the maximum temperatures range between 25 and 28° C.
Winters are relatively cold at night but pleasant during the day. In the lower and middle hills (Gangtok, Darjeeling, Kalimpong), night temperatures average 5° C, and day temperatures hover around 15° C. The alpine region of course becomes very chilly, and temperatures remain well below freezing except during moments when sunlight can seep in through the clouds.
The Monsoon winds strike Sikkim between late May and early June, and there is incessant rain all across the state till late September. Around July and August, torrential downpours sometimes last for several days at a stretch. Gangtok has an annual rainfall of 325 cm
The nearest airport lies at Bagdogra in West Bengal. Locating at a distance of 124 kms from Gangtok, Bagdogra Airport is connected with Kolkata, Delhi, Patna, Imphal and Guwahati. To Bagdogra, there are regular flights from Delhi, Kolkata and Guwahati.
From Bagdogra, there is a Helicopter service to reach Sikkim and vice-versa. Helicopter takes around 20 minutes to reach Sikkim (Gangtok) from Bagdogra. This service is accessible only for once during a day and four passengers are permissible at a time.
By Rail. The nearest railway stations are Siliguri and New Jalpaiguri that lie at distances of 114 kms and 126 kms respectively. Both of these stations are well-connected with Delhi, Kolkata, Guwahati and other major cities of India.
Though Sikkim is positioned at the foothills of the Himalayas, the state has a fine network of roads. Sikkim can be entered through northern areas of West Bengal. Gangtok is linked by road with Calcutta (721 km), Darjeeling (139 km), Guwahati (589 km) and Patna (584 km). It is also directly connected with Siliguri and Kalimpong. The road, connecting Siliguri and Gangtok, is the busiest route in and out Sikkim. There are regular bus services by the Sikkim Nationalized Transport. One can also hire taxis or cabs from different towns to reach Sikkim.