1. the weather -on Everest the temperature never rises above freezing. in winter the temperature averages at 36 degrees C and in summer averaging at 19 degrees C
  2. the possibility of malfunction – A Swiss attempt to climb Everest in 1952 failed by just 250 meters, the cause malfunctioning oxygen canisters.
  3. ice falls -The most dangerous area of the mountain is often considered to be the Khumbu Ice Fall, which is particularly dangerous due to the unpredictable movement of the ice falls.
  4. DEATH!!! – the worst year on Everest, for deaths was 1996 when 15 climbers died and 9 on a single expedition. but hundreds of corpses still liter the mountain.