Best time trekking in Nepal
You can trek in Nepal throughout the year depending on the region. Nepal has tremendous variation in climates due to the vast differences in altitude. The low land plain is sub-tropical (600-1200m), the midland hills are warm temperate (1200-2100m) and the cool temperate (2100-3300m) and the high mountains are Alpine (3300-5000m) and Tundra (5000-8848m). Mid of September to mid of December is considered the best time to trek in Nepal.
Autumn Season (September-November) < Best Season >
Autumn is considered the best season to trek in Nepal. You can experience better visibility of tantalizing mountains, green hills, and excellent weather. Weather is generally clear with mild to warm days and cold nights. The possibilities of natural disasters diminish, making it a safe season to trek. The Nepalese festivals Dashain and Tihar (Dipawoli) are celebrated during this time.
Winter Season (December- February)
in winter, the Himalayan region freezes over and the snowfalls. Trekking can be challenging in the higher altitudes because the trail can be covered with snow. In the winter you should trek at a lower altitude below 3000m. The temperature of the Himalayan region will be up to -18 degrees Celsius, hilly regions 0 to 5 degrees Celsius whereas in plain regions 10 to 15 degrees Celsius.
Spring Season (March-May) <Good Season>
The blooming flowers, lush greenery, and sparkling mountains make for an excellent background to spring trekking. Spring feels like a delight with singing birds, beautiful views, and abundant wildflowers. Weather will be mild at lower elevation but cold at a higher elevation. In spring, mornings are usually crystal clear. However, in the afternoon clouds bring rain showers.
Summer Season (June-August)
In summer, mornings are cloudy with rain in the afternoons and evenings. Trekking is very uncomfortable because the trail becomes muddy, wet, and leech-infested. You risk injury in the wet terrain. Furthermore, there is a higher chance of natural disasters; mainly landslides in the hilly regions. If you trek, you must not forget to carry insect repellants. The temperature of Himalayan regions will be 16 to 20 degrees Celsius, hilly regions 20 to 30 degrees Celsius whereas the plain regions 34 to 39 degrees Celsius. Although this is not a good season to trek, the summer is best for botanists and researchers in the forest and higher altitudes. However, places like Manang, Mustang, and Dolpo are located in a rain shadow. Summer is the best time for these regions. Temperatures are mild and the weather is not so fierce.