Temperature. We all know that the cold in the Himalayas is a serious matter. You don't have to climb Mount Everest to get frostbite - you can get it along the Everest Base Camp trek too if the temperature plummets and you're not properly equipped.
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Day temperatures are comfortable with sunny skies generally prevailing, although it can get well below freezing - even as low as -20°C (-4°F) near Everest Base Camp. If you're looking to trek during the colder months, late Autumn or Winter will be a good fit for you.
According to the Mayo Clinic, during exposure to frigid temperatures like those on Everest—which can dip to minus 20 Fahrenheit during peak climbing season—at first you're liable to feel a prickling, tingling sensation in your outer extremities.
Do Sherpas climb Everest without oxygen ? Even though Sherpas acclimate to thinner air more quickly than other climbers, they still require supplemental oxygen. In the 'death zone,' Sherpas still lack oxygen, therefore supplemental oxygen is essential.
The cost of such an expedition can climb above $70,000. Because of the cost and extreme risk to the retrieval team, few bodies ever leave Everest. And many mountaineers prefer their bodies stay on the mountain if they pass there in the tradition taken from sailors lost at sea.
While gear lists and physical training are similar for climbing both peaks, K2 is widely considered a more technically challenging and dangerous mountain to climb than Everest.
The Everest base camp trek does indulge some risk of Acute Mountain sickness (AMS). There are few stats of causalities among the successful trek of more than 30,000 per year. For most part of such incidents, trekkers with the cardiovascular problems, and improper itinerary resulting in AMS victims.
Trekking to Everest Base Camp is not going to be a walk in the park, but it's not a technical climb and if you're fit enough, mentally and physically, you're more than likely to be up to the challenge. This is a hard and tough trek at altitude and over at least 10 days.