Why Is 0°F With Wind So Much Colder?

Why can the same cold temperature feel so different from place to place? Humidity barely matters in deep cold, because cold air holds very little water: about 17 grams per cubic meter at 68°F, but only about 5 at freezing. The real difference is wind. The National Weather Service wind chill index uses just temperature and wind speed, and at 0°F with a 15 mph wind it feels like -19°F, where exposed skin can freeze in about 30 minutes. Wind can’t cool pipes below the air temperature, but it can chill people and animals.
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