Weather: Nepal has four major seasons:
Because Nepal is quite far south (at the same latitude as Miami and Cairo) the weather is warmer and winter is much milder at lower elevations, including Kathmandu a(elev.1400 meters). It rarely snows below 2000 meters.
Winter: (December, January, and February)
It is cold at night and can be foggy in the early morning, but afternoons are usually clear and pleasant with brilliant sunshine, though there is occasional snow in the mountains.
Winter snowstorms in December and January may make an early spring pass crossing difficult and can present an avalanche danger, especially on the approach to the Annapurna Sanctuary.there may be a week or so of rainy evenings and occasional thunderstorms that blanket the hills with snow.
It never snows in Kathmandu, but there is frost on cold nights in January and February.
It is are good months for low altitude treks and tours
DECEMBER – Wild Honey Hunting, Street Festival
JANUARY – Mustard Field, Mountain View, Quiet Trekking, Poinsettia flowering,
FEBRUARY – Rhododendron, Shivaratri Festival(Birthday of Lord Shiva), Jungle Safari, Paragliding
Spring(March, April, and May):
Days are warm and are the best months for high altitudes and climbing activities Everest itself is black rock during the trekking season, becoming snow-covered only during summer.
MARCH – Ramnawami (Birthday of Lord Ram) at Janakpurdham, Peak climbing & Expeditions, Rhododendron,
APRIL- Peak climbing & Expeditions, White river rafting, Camping
MAY – Nepali New year Festival, Birthday of Lord Buddha,
Monsoon: (June, July, and August):
The monsoon in the Bay of Bengal governs the weather pattern. The monsoon creates a rainy season from the middle of June to the middle of September. It is hot during the monsoon and it rains almost every day, but it is a considerate rain, limiting itself mostly to the night. During this season, trekking in most of Nepal is difficult and uncomfortable. Clouds usually hide the mountains and the trails are muddy and infested with leeches. Most of the precipitation in the Himalayas occurs during the summer monsoon.
JUNE – Wild Honey Hunting, Cordypses Synensis Research, Orchid
JULY – Agricultural season, heavy rainfall, rice plantation, festivals, Wild Mushrooms
AUGUST – Wild Orchids, greenery, Hindu festivals like Gai-Jatra & Krishna-Janmastami
The weather is cool with clear skies, and is the most popular trekking season.
SEPTEMBER – Dashain greatest Hindu festivals, To see Living Goddess Kumari, Mountain view, Trekking
OCTOBER – Tihar (festival of Lights), Apple Garden and Buckwheat field in Jomsom area. Peak climbing, Himalayan Herbs,
NOVEMBER – Bougainville & Cherry Blooming, Peak climbing, Paddy Harvesting, Mountain View & Trekking,
In Kathmandu, spring and autumn days are comfortable and the evenings are cool, usually requiring a light jacket or pullover.
The Himalaya makes their own localized weather, which varies significantly over a distance of a few km. Despite the sanguine assurances of Radio Nepal that the weather will be “…mainly fair throughout the kingdom,” always expect clouds in the afternoon and be prepared for occasional rain.
The hottest month is May, just before the rains start.
Temperatures in Kathmandu are as follows:
* October – Max. 88 F/ 31 C – Min. 58F/ 14 C
* January -Max. 66 F/19 C – Min. 37 F/3 C
* April – Max. 84 F/ 29 C – Min. 46 F/ 8 C
Temperatures in the Everest region average 20 to 30° F (10 to 15° C) colder than the above figures up to about 14,000 feet, the highest point reached on a short Everest trek.
Near Pokhara, temperatures are 5 to 10° F (3 to 5° C) warmer than Kathmandu.