At first, in order to know what you have to pack in regards to weather and temperature, you should know when is the best time to go to Nepal. Though you can trek in Nepal throughout the year, most of the trekkers land in Kathmandu between fall and spring—the peak seasons.
Fall Months (September-November) – The fall is the most popular season. The sky stays often clear and sunny. Temperature is mild, though November is technically when the temperature begins dropping; and there is little precipitation. The only downside is a load of tourists makes the teahouse trails overcrowded.
Winter Months (December-February) – Some of the experienced trekkers buy their flights to Nepal for winter trips, though the period is considered as the off-season. The temperature is bitter, the daylight hours are short, and sudden storms can disrupt travel plans. Also, heavy snowfall will cut off popular high passes.
Spring Months (March-May) – The second popular trekking season in Nepal is Spring. The snow from the previous winter begins to melt, and the landscape turns into a rainbow of color. The trails also become crowded, and the sky will be slightly hazy at lower elevations.
Monsoon Months (June-August) – Landslides and flooding might make your trek unpleasant. The weather is hot, humid, and the sky is constantly covered in threatening clouds. It is always better to avoid monsoon season if you can. Some rain-shadow zone such as Mustang and Dolpo are considerable during the Monsoon.
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