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You are here: Home / Data and maps / Maps and graphs / Average extent of arctic sea ice in March and September 1979-2007

Average extent of arctic sea ice in March and September 1979-2007

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Arctic sea ice grows to its greatest yearly size in March and melts to its lowest size in September

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The figure shows the average ice extents for these two months after 1979. The linear trend for March indicates that the Arctic is losing an average of 44 000 km2 of ice per year in winter. The corresponding value for September and summer is 72 000 km2.

Geographical coverage: Arctic and the North pole

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