Nepal’s weather is generally predictable and pleasant. There are four climatic seasons: March–May (spring), June–August (summer), September–November (autumn) and December–February (winter). The monsoon is approximately from the end of June to the middle of September. About 80 per cent of the rain falls during that period, so the remainder of the year is dry. Spring and autumn are the most pleasant seasons; winter temperatures drop to freezing with a high level of snowfall in the mountains. Summer and late spring temperatures range from 28ºC (83ºF) in the hill regions to more than 40ºC (104ºF) in the Terai. In winter, average maximum and minimum temperatures in the Terai range from a brisk 7ºC (45ºF) to a mild 23ºC (74ºF). The central valleys experience a minimum temperature often falling bellow freezing point and a chilly 12ºC (54ºF) maximum. Much colder temperatures prevail at higher elevations. The Kathmandu Valley, at an altitude of 1310m (4297ft), has a mild climate, ranging from 19-27ºC (67-81ºF) in summer, and 2-20ºC (36-68ºF) in winter.

                             Kathmandu              pokhara                  Chitwan
                             Max    Min               Max    Min               Max    Min                 

January                 19        2                20        8                 24        7
February               20        4                21        8                 26         8
march                    25        8                27      11                33       12
April                      30      11                30      16                35       18     
May                        30      16                30      19                35        20     
June                       30      20                30      20                35       23     
July                        30      21                30      21                33        24
August                  29      20                30      21                33        24
September           27      19                29      20                32        22
October                23      15                27      18                31        18
November           23        4                23      11                29        12
December            20        2                20        8                 24         8

Required clothing:
       Lightweight and tropical clothes with umbrella are advised for June to August. Between October and March, lightweight clothes are worn in Kathmandu, with a coat for evenings and warm clothing for the mountains.