From: utzoo!watmath!kpmartin Newsgroups: net.misc Title: Re: Wind-chill factor Article-I.D.: watmath.2994 Posted: Mon Jul 12 08:09:43 1982 Received: Mon Jul 12 23:16:28 1982 References: rabbit.595 I suspect that people perspire so little in cool weather that the relative humidity makes little difference. Also, when the cold air is warmed by your skin the relative humidity drops, since the total capacity for water vapour has increased. I suspect that most of the wind chill effect is merely due to the stirring of the air. In still air, a thin layer of warm air forms over the skin (and rises to form a plume above you). As the wind increases, this layer becomes thinner and cooler. So the temperature you feel when it is -10 is not really -10 unless it is VERY windy; it is probably closer to +10 (celsius). For high wind speeds, the cooling effect will approach that of a steel block, or a body of fluid, both of which have higher heat capacity and better cunductivity than air.