Nepal has different climatic conditions because of its varied geographical regions: the Himalayan region, the hilly region, and the Terai (plain) region. The climate is hot and humid in the Terai, moderate in the hilly areas, and very cold in the Himalayan region. Nepal experiences four main climatic seasons.
Autumn (September – November)
Autumn is one of the best seasons in Nepal. The weather is generally clear and stable. Days are warm, while nights are cool, and higher elevations experience freezing temperatures. This season is also the main festival period in Nepal. Mountain views are exceptionally clear and beautiful.
Winter (December – February)
Winter is cold in the Terai and hilly regions, while temperatures drop below freezing in the high Himalayas. Most days are clear, though occasional clouds may appear. Heavy snowfall occurs at higher elevations and sometimes even in areas above 2,500 meters. January and February are the coldest months. Winter travel and trekking are challenging but adventurous.
Spring (March – May)
Spring is another pleasant season with fine weather. Mornings are clear and slightly cool, while afternoons can be warm with occasional rain and thunderstorms. Forests become green, and many flowers bloom during this season. Trekking trails are especially beautiful with blooming rhododendrons. Snow is minimal, even in Himalayan trails. Towards the end of April, cloudy days become more common.
Summer /Monsoon (June – August)
The monsoon season begins in June and lasts until mid-September. Mornings are usually cloudy, and heavy rainfall occurs, especially in July and August. Thunderstorms are frequent during this time. Most trekking trails become muddy, making travel difficult, except in trans-Himalayan regions like Dolpo and Mustang. Rivers and streams swell, and landslides are common in hilly areas.