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The season starts from late September till May as the monsoon begins in early June and continues up to early September. After the monsoon the visibility is very good and the festival Dashain and Tihar are observed throughout the country during this time.
January and February are extremely cold at higher altitudes and there is snowfall too. These months offer excellent trekking for well-equipped groups or for those who remain at lower elevations.
Late February/ march the beginning of spring in Nepal with hillsides covered with wild flowers and rhododendrons above 2000m. The mountain views are excellent and the temperature is quite moderate even during the nights.
Late April and May are hot in lower areas. The visibility is poor, high altitude treks are good in this season. | 
