With the variation of the geographical features, climatic conditions of Nepal varies from one to another. In the north summers are cool and winters are severe. Summers are tropical in the south and winters are mild. Nepal has five seasons namely: Spring, Summer, Monsoon, Autumn and Winter. The summer temperatures exceed 37° C in the Terai and even higher in some areas. Similarly, winter temperatures range from 7°C to 23°C in the Terai. Summers are temperate in mountains regions, hills and valleys while winter temperature can go below zero. In Kathmandu valley summer temperatures ranges from 19°C – 35°C while winter temperatures ranges from 2°C – 12°C. The average temperatures drops 6°C for every 1,000m you gain height. Eighty percent of all the rain in Nepal is received during the monsoon ( June-September) .The average annual rainfall is 1,600mm, but it varies by eco-climatic zones, such as 3,345 mm in Pokhara and below 300 mm in mustang.
There is no any seasonal constraint on travelling in Nepal since there are compensating bright sun and brilliant views even in winter (December and January) . The best time to do trekking in Nepal is during the spring and autumn. The clearest skies are found after the monsoon in October and November. Rhododendrons blooms in spring. However, Nepal can be visited all the year round.
Average temperatures and rainfall during peak summer and winter in three most popular tourist areas:
For more information about the Nepal’s climatic conditions, please visit the official site of the Department of Hydrology & Meteorology, Ministry of Environment.