The Frigid Zones are the areas north of the Arctic Circle and south of the Antarctic Circle. They are the coldest places on Earth and have extreme weather conditions.
These polar regions experience a midnight sun, when the sun is above the horizon for 24 hours, and a polar night, when the sun does not rise for 24 hours. The centers of both Frigid Zones, where the north and south poles are located, have six months of daylight and six months of night. The Frigid Zones were named by Aristotle, who believed everything north of the Arctic Circle and everything south of the Antarctic Circle was permanently frozen and uninhabitable.