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As the wind increases, it removes heat from the body, driving down skin temperature and eventually the internal body temperature. Therefore, the wind makes it FEEL much colder. If the temperature is 0°F (-18°C) and the wind is blowing at 15 mph (13 kts), the wind chill temperature is -19°F (-28°C). At this level, exposed skin...and tongues...can freeze in just a few minutes.
Learn more about the wind chill in JetStream - An Online School of Weather.