Arctic sea ice extended for 3.5 million square miles (9.1 million square kilometers) — 309,000 square miles (800,000 square kilometers) below the record set in 2006. The National Snow and Ice Data Center says it was the seventh month this year to set a record low.
Some Arctic air was 18 degrees warmer (10 degrees Celsius) than normal and seawater was 7 degrees (4 degrees Celsius) above normal, preventing sea ice from forming. Data center scientist Julienne Stroeve blamed natural weather patterns and man-made global warming.
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