Arctic ice extent averaged for the month of January was 14.08 million square kilometers (5.43 million square miles). January extent was 760,000 square kilometers (293,000 square miles) less than for the 1979 to 2000 average, and 310,000 square kilometers (120,000 square miles) greater than for January 2007.
During the month of January, Arctic sea ice extent increased by 1.12 million square kilometers (440,000 square miles), an average increase of 36,000 square kilometers (13,900 square miles) per day.
Graph with months on x axis and extent on y axisFigure 2. The graph above shows daily sea ice extent.The solid blue line indicates 2008–2009; the dashed green line shows 2006–2007 (the record-low summer minimum occurred in 2007); and the solid gray line indicates average extent from 1979 to 2000. Sea Ice Index data.
—Credit: National Snow and Ice Data Center
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