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Extremely cold temperatures can be extremely dangerous.
Frostbite can happen in minutes and affect any exposed skin, especially on your fingers, toes, nose and ears.
Wind speed can also affect the onset of frostbite: the lower the wind chill temperature, the greater you are at risk for developing frostbite.
When temperatures plummet, this handy chart can help you estimate how long it'll take for frostbite to develop.
To use the chart, just find where your current outside air temperature intersects with the current wind speed.
Signs of frostbite can include the formation of ice crystals on your skin as well as numbness, redness and/or pain in an area of exposed skin.
GET MEDICAL ATTENTION IMMEDIATELY
The best way to avoid frostbite is to stay inside where it's warm, but if you must venture outside, always remember to stay dry and cover up completely.