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A human can surivive any low or high temperture with the right gear now if you mean naked about a range of well -80 to +50°C but even then a human body is very fertislie only time is the real killer if your core temperature goes below 35C then you are now in hypotermia if you spend a couple hours in the freezer without proper clothing to protect you. You will die from hypothermia. It goes even faster with achocal and age. So to some it up with time when a human core starts to go below 35° C it is dieing