The area has a severe subarctic climate (Köppen Dfc), for which it just qualifies due to its 10 °C (50 °F) July means.

Due to the frozen nature of Hudson Bay, there is a severe seasonal lag until June despite much sunshine and perpetual twilight at night.

Cold extremes are severe, but in line with many areas even farther south in Canada's interior.

Unlike those areas, Coral Harbour remains beneath −25 °C (−13 °F) in terms of average high in the midst of winter.

Throughout December 2010 and early January 2011, Nunavut, northern Quebec and western Greenland set many high temperature records.