Weather in the mountains is notoriously difficult to predict. At night it is generally cooler however the days are warm. Winter (January and February) will be bit colder but the days can be quite beautiful and warm if the sun is out. There will be bit of snow during the month of January, February and December. It is also important to make sure that you can stay warm and dry in just about any conditions. Expect the unexpected!
Average Temperatures in Nepal ( in Degree Celsius )