The Arctic is the northernmost region of Earth. Most scientists define the Arctic as the area within the Arctic Circle, a line of latitude about 66.5° north of the Equator.

Other definitions are:

  • 10°C July isotherm line that is defined as being the area where the average temperature for the warmest month (July) is below 10°C / 50°F.
  • Arctic Human Development Report (AHDR) line.
  • Arctic Emergency Prevention, Preparedness and Response (EPPR) line.
  • The line of the conservation of Arctic Flora and Fauna (CAFF).
  • The line of the Arctic Monitoring and Assessment Programme (AMAP).
  • The Arctic Tree line boundary that is the northernmost latitude in the Northern Hemisphere where trees can grow, farther north it is too cold all year round to sustain trees.


See also our map of Arctic Definitions

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