To give you some idea of the climate in Nepal, the hot and humid months are from April to September. During this period Monsoon last from early June till mid September. The dry months start from October to April. Winter (cold and damp during the evening) starts from November through to February. Approximate temperatures are:
Kathmandu & Tansen 15 – 34 OC 1 – 20 OC
Okhaldhungha / Terai plains 25 – 40 OC 8 – 25 OC
There is no central heating in homes or buildings in Nepal. However, gas heaters can be purchased locally.