Table 1.

Dates of Maximum (Max) and Minimum (Min) Northern Hemisphere Sea Ice Extent, Using the Same Data as in Figure 1, for the Years 2007–2013^a

	Max	Min
2007	Mar 12	Sep 18
2008	Mar 13	Sep 20
2009	Mar 5	Sep 13
2010	Apr 2	Sep 21
2011	Mar 9	Sep 11
2012	Mar 20	Sep 16
2013	Mar 15	Sep 13

^aMar = March, Apr = April, Sep = September. The ice retreat season for each year is defined here as starting 1 week before the maximum and ending 1 week after the minimum.