Temperatures on Denali can hit over 30oC in the sun at higher altitudes and plunge to -30oC at night; at the latter temperature a person could freeze to death in just a few minutes. The temperatures, frozen conditions, and the "midnight sun" all push one to the limit.
麥肯尼峰，這座位於極圈邊緣、美國阿拉斯加州境內的高山，白天平均溫度高達攝氏三十度，晚上可以降至負三十度，低溫可在數秒鐘內將人瞬間凍斃，極圈的低溫、冰河及永晝現象在此挑戰著人們的意志力。