Himalayan region climate varies as per the altitude wise from the low southern land of Gangetic plains of Terai at 60meters above sea level to the mid hills-valleys at 9,00m, 1500-200m and to the high mountain settlement at 3000-4000m and above. From over 40oC warm sub-tropic, to the arctic climate of -0oC to -20oC conditions exists. Here's our Climate Guide that can help you with your selection of treks in the Himalayan region and Good Luck!
Nepal and its Himalayan range have a typical monsoonal two season a year. There's the dry season from October to May and the wet season, the monsoon, from June to September. September-November, the start of the dry season, is in many ways the best time in Nepal and around the Himalaya.
As the Himalayan regions have low precipitations, the snow fall is limited depending upon the region, season and elevation.