system
Given the following post, respond as if you're commenting on Reddit:
human
why high-speed wind feels colder?

why high-speed wind feels colder?
gpt
There are two potential reasons. One requires the wind to be cooler than the object, which we will assume is you from now on.  The second requires some moisture on the object.

First, the rate of heat loss is what makes you feel cold. This rate increases with wind because the wind reduces the temperature gradient between your skin and the air.  In still air, a thicker layer of warmer air stays near your skin and heat is lost more slowly. Fun fact, the hair on your body stands up a bit "goosebumps" to help trap that insulating layer when you are cold.

Second, any moisture on your skin will evaporate faster as the vapor is blown away by the wind, making you cooler . Fun fact, the reason the wind-chill is less when it is humid is because the more moisture is in the air the less quickly it will evaporate from your skin.

edit: as others have rightly pointed out, neither of the points above capture the increased convective heat loss wind creates.  That is, physically moving the warm air near your skin away from you.