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Before you choose the time you want to trek in, there are some elements that you should put into consideration and most significant of these is without a doubt the weather which witnesses fluctuations in rainfall and temperature.
Weather In The Everest Region
Nepal’s variation in temperature overlaps with the European seasons since Nepal is located in the Northern Hemisphere. Beyond this, however, the weather is greatly affected by two major forces: winds coming to its north from the major Asian continent and, winds coming over the Bay of Bengal. From June through to August which are the summer months, the winds coming from the Bay of Bengal dominate, ushering in the South East Asian monsoon. From December to February, the winds from the major Asian continent dominate bringing very chill weather in the winter.
You may have come across articles about how vital the timing is for the attempts to ascend Everest and this is due to the fact that there exists a very brief window when the winds from the South and North nullify each other to create a short period of calm. The net effects of these constantly complementary climate influences are that the mean rainfall and temperatures are below at Everest base camp.
As expected, most of the precipitation at base camp is snow in the winter months. The other main element that affects the weather at Everest base camp apart from the major climatic factors which control the periodic fluctuations in weather is the altitude. There is a big monthly difference in temperature which you can see on the altitude profile of the typical Everest trek.
For those individuals who desire Climbing mountains with Kandoo Adventures, the tourism outfit has recommendations on each and every of the mountain they offer trekking services on. Highlighted below are their recommendations on trekking seasons for Everest after they have taken all the issues pertaining to weather into account.
February - May
February to May is a very good period to trek with warmer conditions and clear, bright days. Just coming out of winter, you can yet anticipate the infrequent short shower, but most of the days will be quite steady and dry. Also, lookout for the striking rhododendrons on exhibition in April! Since this is the part of the year when most summit attempts on Everest happen, you should anticipate this time to be busy though. However, this is a great period to feel the buzz and activity encircling the ascending tours and actually meet individuals having a goat the summit. The opportunity to pass the night with an expedition team at base camp is one exclusively offered by Kandoo.
September - October
The most popular period for climbers is September to October as it provides the clearest andsteadiest weather. This is a plus since most treks present striking vistas which, on a clear day, are just remarkable. This time offers a pleasing temperature for climbing even though not the warmest period of the year and the nights do not become super-chilly as they do in winter. You will have to put up with a good deal of traffic though, given that around this time, the popular routes get so busy. This is an ideal time to deliberate the choice of one of the less popular routes that will take you away from the crowds and off the much-trodden track. Though normally clear, storms sometimes hit during this time and you should take along appropriate gear just in case of this.
November – January
On the Nepalese calendar, the coldest period is November through to January; but Everest can still be hiked at this time for the truly hardy trekkers. The weather is generally quite steady and dry although very cold. The coolness of the weather will to a great extent be subject to how high you desire to trek. If for instance, you are heading to Everest Base Camp, then anticipate overnight temperatures of about -20°C to -30°C. But if you remain in the valleys, the temperature will stay quite temperate and you will have no issues. Even though far less teeming, do not forget that trails over any high passes such as Mera Peak trek or Gokyo trail are closed during this time and the days will be much shorter.
June - August
Due to the monsoon, in the Himalaya, the wettest period is June through to August. The monsoon period is rife with torrential deluges that are short and sharp. The trails and teahouses get empty in June and only hikers aiming to trek high are left all through these months. You will get very heavy snowfalls or rain even if you are trekking high.