October and November are good months to visit Nepal when the air is crisp and clear, and the country is lush and green following the monsoon. February to April is also a good time when the weather is warming and many flowers are in bloom. Some haze does set in by April obscuring the mountain views. The weather is clear but chilly in December and January. May and early June are the warmest months, and the monsoon is prevalent from the middle of June to September. At 4000 meters, the Kathmandu Valley is relatively temperate. Chitwan in the Terai region is warm and can get quite hot by April.
Nepal's climate follows a monsoonal two-season pattern. The dry months last from October to May with the monsoons from June to September. The latter months also tend to be very hot and humid with temperatures often rising above 35ºC.
In general, during the day it is best to wear light, comfortable cottons with a pair of good ventilated walking shoes. Early morning and evening temperatures in the months of December and January can be chilly and it is advisable to carry jackets or jumpers for warmth. The northern mountain region, around an altitude above 3,300m, has an alpine climate with considerably lower temperature in the winter months of December to February. Adequate warm winter clothing is recommended.
For the sightseeing sessions you may find a good pair of sunglasses and a sun-hat handy. At monuments and temples, it is advisable to avoid sleeveless tops and short skirts.
You may also be asked to remove your shoes.
For itineraries which include a nature reserve, clothing in neutral colours such as beige, brown, khaki and green is suggested for wildlife and bird-watching sessions. Full-length trousers are better suited than shorts for jungle activities. A pair of binoculars is also recommended. Leeches tend to proliferate during the monsoons and it is advisable to carry leech socks and raingear if trekking during these months.
Most hotels, including the more exclusive ones, do not insist on formal wear in restaurants and smart casuals are acceptable.
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