The Alaska Range is comparatively young, only about 5 million years old. Denali National park is 6 million acres of pristine wilderness and one ribbon of road. The summit of North America, Denali (The High One) is the Native (Athabascan) American word for North America's highest peak, Mount McKinley in the mountain chain called the Alaska Range. Denali was renamed Mount McKinley for William McKinley, a nominee for president, by the Princeton graduate and gold prospector, William Dickey. Dickey was one of the hundreds of prospectors seeking gold in the 1896 Cook Inlet stampede. Since the turn of the 19th century, the official name of this great mountain has not rested in peace. In 1914, following his historic first ascent of the mountain in 1913, Hudson Stuck wrote in the preface of his book, The Ascent of Denali: "Forefront in this book, because forefront in the author's heart and desire, must stand a plea for the restoration to the greatest mountain in North America of its immemorial native name." In 1980, the name Mount McKinley National Park was officially changed to Denali National Park and Preserve. The State of Alaska Board of Geographic Names has also officially changed the mountain's name back to Denali. Negotiations continue today to officially return the original native name to this magnificent mountain. There are many different routes up Denali some extremely technical. Denali's most used route is the West Buttress route (80% of all climbs), which has seen more than 20,000 climbers, Roughly 50% of the climbers have reached the summit. 6194 meters or 20,320 feet. The difference in the barometric pressure at northern latitudes affects acclimatization on Denali and other high arctic mountains. Denali's latitude is 63° while the latitude of Everest is 27°. On a typical summit day in May, the Denali climber will be at the equivalent of 22,000' (6900M) when compared to climbing in the Himalayas in May. This phenomenon of lower barometric pressure at higher elevations is caused by the troposphere being thinner at the poles. Snow and weather conditions for climbing major Alaska Range peaks are usually best from May through July. Colder minimum temperatures and strong northwest winds commonly occur in May. Late June and July are warmer but more unsettled. By late July, travel on the lower glaciers is made difficult by melting snow bridges over crevasses and by more inclement weather with heavier snowfall and increased avalanche danger. The highest success rates occur in June. April is an excellent month for many of the lower peaks with conditions often cold and clear while the winter extremes still linger on Denali and Mt. Foraker. The coldest weather on Denali is found from November through April with average temperatures ranging from -30F to -70F recorder at the 19,000 foot level. It is not uncommon to find it -50F at the 17,200 foot camp in early May. Winter climbing in Denali borders on the ridiculous more because of its unfathomable risks than because of its mountaineering challenge. Some of the world's best climbers have either disappeared or perished from literally being flash frozen! In winter months, the jet stream, +100mph (160 km/h), will often descend over the mountain's upper flanks. Combine this wind with the naturally caused ventura effect that doubles wind velocity in such areas as Denali Pass and you will find one of the most hostile environments on this planet. The combined effect of ferocious wind and extreme cold easily and routinely send the wind chill off the charts. (from the Denali park website).