Nepal is a mountainous tropical country, which means it experiences climatic extremes. Night and day temperature differences can vary between 10°C and 30°C (50°F to 86°F) so you need to be prepared with a variety of clothing. The key to staying comfortable on a trek is layering. Suggested items to bring include:
1-3 days Trekking
1 week Trekking
2-3 weeks Trekking