The longer three-month period, stretching from September to November, was also unusually warm—the second warmest on record since 1880; only 2005 was warmer. For the entire year to date, 2013 is on track to be among the top five or six warmest years since we started keeping track. All ten of the ten warmest years on record have happened in the past 15 years [ http://www.nasa.gov/topics/earth/features/2012-temps.html ].