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When to Trek?

There is always somewhere to trek at any time of year...

What will the weather be?

The most important factor in deciding when to trek in the Himalaya is the weather, which has a monsoonal climate; heavy rains driven north from the Bay of Bengal engulf the region from June/July to September/October. This means that regions in the east, like Bhutan, Kanchenjunga and Makalu, receive heavier amounts of rain than in the west. The result is that the eastern ranges of tend to have slightly shorter trekking seasons than the western Himalaya, which is drier. However, Ladakh and Far West Nepal tend to have longer, more severe winters due to their more northerly latitude.

The monsoon season is not a very popular time for general trekking as the valleys that approach the mountains suffer from sporadic and sometimes intense rainfall, leeches along the trail, transport delays and limited views. However, in Ladakh and the Annapurna and Dhaulagiri massifs block the northerly push of the monsoon clouds and create a partial ‘rain-shadow’ along the border with Tibet. Accordingly, Naar, Phu, Mustang and Dolpo only receive brief showers each day during the rainy season which transforms their arid landscapes into fields of wildflowers and the locals get busy planting crops.

After the monsoon has finished, stable dry conditions predominate throughout the Himalaya for two or three weeks until a storm front of unpredictable intensity affects some areas, usually in the third or fourth week of October.

The weather then stabilises again, probably until late November when the chance of occasional showers coincides with the beginning of a colder weather pattern. The clear skies and cold nights of December and January are in turn replaced by winter storms in mid to late February.

The beginning of March sees the sun regain intensity and the weather becomes unstable for alternating periods of three to five days. By the end of March dry, warm weather is the norm but haze begins to build in the lower valleys. As temperatures rise through April the remaining rain clouds disperse to be replaced by hot, hazy conditions largely produced by dust blowing up from the plains of India, and local fires.

May to June is the hottest period of the year, only cooled by occasional pre-monsoon storms, which gradually gain in intensity until the monsoon begins with vigour, usually at some point from mid June to mid July.

 

Weather stats in some popular trekking locations in Nepal Weather stats in some popular trekking locations in Nepal

 

Himalayan Seasons

  • October to November is a very popular trekking season as the entire country has long spells of fine weather with relatively clear air for photography. Occasional storms can dump large amounts of snow at higher altitudes, and the night-time temperature frequently falls below freezing above 4000m (13,123ft).
  • December to January boasts the clearest skies for photography and the coldest temperatures, frequently falling below -5°C above 4000m. Many of the locals who live above 4000m in the warmer months begin to move down during December, so it is important to check that you’ll be able to re-stock or find shelter prior to departure.
  • February to March is warmer than January but occasional heavy rain and blizzards sweep over the mountains, sometimes closing passes for weeks. In March, early spring rain brings the first rhododendron blooms at lower elevations. Dust from India begins to obscure views towards the end of March and temperatures climb considerably in the lower valleys.
  • April to May is renowned for the progressive blooming of rhododendron up to the tree line (some sheltered flowers will continue into June). In May, temperatures start to get very high at lower elevations and haze obscures views of distant mountains. This is a good time to spot migratory birds.
  • Note: The introduction to each trekking region states the ideal times to visit.

Climate Change

In recent years locals throughout the Himalaya have begun believing that the traditional weather patterns are becoming more unpredictable; this they attribute to climate change. There are obvious examples of glacial recession and while there may be insufficient scientific data to prove their theory at present, it is obvious that things are changing. Be careful with Himalayan weather, it can be very severe and unpredictable.

For more information see:

Himalayan Climate Initiative, : www.Himalayanclimate.org

International Centre for Integrated Mountain Development, : www.icimod.org

 

Weather Reports

It is a good idea for those walking long sections of the GHT to receive regular weather reports. This is most commonly done via mobile phone along the main trails and satellite phone systems in remoter regions, contact the team at Everest Weather (: www.everestweather.com) for more information.

For those trekking in remote regions it is recommended you familiarise yourself with all the following websites and learn about the implications of wind direction and storm risk.

Which Style of Trek Best Suits You?

Go it alone? Need a guide but want some comfort along the main trails? Or want to camp and explore the GHT?

Next : Trek Styles