Nowhere in the world is the climate so distinct and poles apart. The year is divided into 4 different seasons in Nepal – winter, spring, monsoon and autumn. The best period to visit the country for plant lovers is during spring when the flowers are in full bloom. The mountain slopes are covered with beautiful and colorful flowers. Spring season commences from early March and continues until late May. Even though the days are clear haze disturbs the mountain views. Late May, and the downpour begins. It continues till late August. It continues till late November. With temperate climate, clear blue skies and extraordinary mountain views it is the best season to visit the country.
Monsoon season is approximately from the end of June to the middle of September. About 80% of Nepal’s annual rainfall is during that period, so the remainder of the year is pretty dry. Spring and autumn are the most pleasant seasons; winter temperatures drop to freezing, with a high level of snowfall in the mountains, while high summer can be blisteringly hot. Summer and late spring temperatures range from 28ºC (83ºF) in the hill regions to more than 40ºC (104ºF) in the Terai. The long stretch of the northern frontier, which is mostly rugged terrain, towered by the mighty Himalayas experiences arctic type of climate and a few hours down south at the fringes of the Indian borderlands the landscape and climate changes dramatically as the elevation decreases. With lush green tropical forests and vast stretches of plains one can encounter hot humid climate.
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. When trekking in the mountains, high quality trekking gear that can handle minus temperatures is recommended all year round.