I tried to check some atmosphere stuff from here: http://www.srh.noaa.gov/jetstream/atmos/layers.htm It says I thought that the temperature is by definition a quantity which always becomes equal between materials which are in physical contact. So if a human body would get cold in the upper mesosphere, doesn't it mean that the air is cold there? Furthermore, if a human body gets cold there, don't temperature gauges get cold too? How are those high temperatures even measured? update: I already got one idea. The page explains the reason for high temperatures to be this: Does this mean that we should consider the system, consisting of both the electromagnetic radiation and the air molecules, to be the system which is in a high temperature? And if a human goes out there and doesn't protect him or herself in a shadow, he or she will get fried? update 2: I don't believe that the idea of the first update is the solution to the problem. A better sounding idea is presented in the post #7. Although the frying effect of the sun's radiation is probably notable too.