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> It's hard to be cool when you're cold!
Amen to that!
A couple of things to remember about wind chill, though: first, it doesn't mean squat except on exposed skin. There's no such thing as "what's the wind chill outside today, honey?" Wind chill does not exist on the surface of your jacket or gloves, and is nearly impossible to compute inside them unless you know the temperature of the air and the velocity of the air filtering its way through at the surface of the skin.
Another difference from heat index is that ambient humidity plays no significant role in cooling of the skin at low temperatures, except when the air is nearly still. It's too small a factor at higher velocities. That's why it isn't included in the tables.
(Humidity is also not a direct factor in the formation of black ice. Where leftover precipitation is the source of the water which forms the ice, relative humidity during the preceding day can help determine how much water remains for freezing. Forecasters already take that into account, though.)
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John
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