How cold is the arctic ocean?

How cold is the arctic ocean yearly average?

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• Answer:

  Scientists define the Arctic in three major ways. First, as the area north of the Arctic Circle (latitude 66°30′ north). Second, as the region north of the 10° C (50° F) summer isotherm. The summer isotherm is a line on a map drawn through locations with an average annual temperature of 0° C (32° F) or less and a mean temperature for the warmest summer month of 10° C (50° F). Third, the Arctic is defined as the region north of the tree line, the point beyond which trees do not grow. The summer isotherm and the tree line enclose roughly the same territory, which is somewhat larger than the region bounded by the Arctic Circle.