The red line shows the 1981 - 2010 daily average sea ice extent for that date. (carbonbrief.org)
Although the June 2008 ice extent was similar to that seen in 2007, the observed rate of decline slowed in July, resulting in a monthly averaged sea ice extent for July 2008 that was 0.90 million sq - km above 2007. (searcharcticscience.org)
It should be recalled that we are comparing these Outlook values to the September average sea ice extent as provided by the National Snow and Ice Data Center (NSIDC). (searcharcticscience.org)