Because the air pressure is lower then at sealevel, the boiling temperature of the water is lower. Unless you have a (high) pressure cooker.
At high altitude
At a high altitude, water reaches its boiling point at a lower temperature because of a lower air pressure holding it in its liquid form.
All you have to do to reduce the boiling point of water is go to a higher altitude and boil it.
The mountain is not said to be a techncal climb, it is the high altitude and lack of oxygen that makes it hard to climb.
because the air is thinner the higher the altitude is.
There are many dangers that the climber will face while on Mount Everest. High altitude Pulmonary Edema High Altitude Cerebral Edema Frostbite Hypothermia Snow Blindness Crevasses Avalanches Rock Fall The Weather
You would have to be somewhere VERY up high. the change in altitude would decrease the boiling point.
There's a smaller column of air pressing down at high altitudes, so air pressure is less.
At this altitude (2150-2200 ft) water will boil at about 97.8 oC . It also depends on the weather (high/low pressure).This is calculated according to 'Water Altitude Boiling Point Calculator' (Cf. 'Related links' just below this answer. Select on opened site page the 2nd button 'What is the local altitude' in ft. or m.).
According to this limit, the boiling point of liquids diminishes as pressure is reduced, and above 63,000 feet altitude human blood and other fluids will boil at 98 degrees Fahrenheit. Without the pilots protective assembly, any liquids outside the human body, such as saliva and tears, will boil.
the air is super thin cuz of the high altitude
The boiling point of water changes with altitude. While it boils at 100C at sea level, at the summit of Mount Everest water would boil at a lower temperature of 72C.