system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why does 85 degrees Fahrenheit outside feel warm, but 85 degrees Fahrenheit water feel cold?
gpt
The feeling of hot/cold is not a measure of the absolute temperature of what you are touching. It is a sensation that tells you how much heat your body is losing or gaining. 

Air, for various reasons, doesn't give or take away heat as efficiently as water. In 85 degree air, your body's natural ability to generate heat keeps up with, or even exceeds, the heat you are losing to the air, so you feel warm. The water, on the other hand, draws a lot of heat away from you right away---faster than your body makes up for it. Since you are thus transfering heat away, you feel cold.