Why does air feel colder when it’s moving fast?
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What your body senses is not the temperature, per se, but the rate at which your skin is losing (or gaining) heat. This is called “heat transfer”, and it’s what’s really important. Temperature is a big part of it, but wind and humidity have a lot to do with it too. Still air at (say) 40F will pull a certain amount of heat out of you, but the same temperature air blowing across your skin at 25 mph will pull a *lot* more heat.
Here’s another example: imagine a wooden board at 70 degrees, and a stone countertop at 70 degrees. The stone will feel much colder to the touch than the wood because stone is a much better conductor of heat, and pulls the heat out of you much more efficiently than the wood.
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