University of Illinois Extension

Wind Chill Index – Frozen Noses, Ears and Toes!

Photo: NWS

Photo: NWS
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Scientists have developed an index that will let you know if the combination of cold temperature and winds are a danger to humans. This is called the Wind Chill Index.

Wind chill numbers lower than -18° F are very dangerous, because a person’s skin can become frozen within 30 minutes or less. Frozen skin is sometimes called frostbite.

A temperature of -5° F with a wind speed of 30 miles per hour creates a wind chill of -32° F. At this wind chill, frostbite would occur within 10 minutes.

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