From the National Institute for Occupational Safety and Health (NIOSH):
Depending on where you reside and work this season, Old Man Winter might be knocking on your door, bringing you snow, ice, and chilling temperatures. For those in warmer areas of the country, it may be difficult to imagine some winter weather extremes. For instance, according to the NOAA National Climate Extremes Committee, the existing record for lowest temperature in the United States was -80°F (-62.2°C) in Prospect Creek, Alaska, in 1971. Luckily, most workers will not encounter conditions quite so extreme.