The climate of Nepal can be broadly divided into two seasons. The dry season runs from October to May and the wet (monsoon) season rungs from June to September. Autumn (September to November) and spring (March to May) offer warm daytime temperatures, clear skies for mountain views and perfect weather for trekking, rafting or just roaming around the Kathmandu Valley.
The peak season for tourism runs from October to November: the landscape is green and lush from the recent monsoon rains, the air is crisp and clean, and the views of the Himalaya are crystal clear. However, competition for seats on international and domestic flights can be fierce, and lodges and hotels fill up quickly – very frustrating if you have left your bag at a particular hotel while trekking. Always book ahead at this time of the year. You should also consider the disruption caused by the annual Dasain festival in October.
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By early December winter is starting to creep in and most trekkers retreat from the high-altitude trekking routes. Heading for Everest Base Camp at this time of the year can be a real feat of endurance, and the Annapurna Circuit is often closed by snow on the Thorung La. Even the Kathmandu Valley can feel chilly after dark, and the morning mist can play havoc with flight schedules. Tourists start to leave Kathmandu in December like flocks of migratory birds, headed for warmers climes of India or Thailand. However, this is a great time to enjoy the national parks of the Terai without the crowds.