As the cabin pressure increases, so too does the temperature. This is why the cabin must be air-conditioned. The air temperature on the top of a mountain is less because the pressure is less. Think about it. Since you are high up, there is less air above you.
Bigger mountains exert huge pressures on the rock under it.
Evaporation removes heat. Sweating takes away 585 calories per gram. In Death Valley, California, the temperature often exceeds 100 degrees Fahrenheit. However, it doesn't feel that hot because the evaporation of sweat takes away a lot of heat. Humidifiers make one feel warmer in the winter.