The first 15 days of April have been uncharacteristically warm across the eastern 2/3rds of the US. Here are the US temperatures compared to average for the first week of April.
A quick look at US statewide temperature rank starting in September of 2009
Was this March historically warm? March of 2007 featured widespread warmth
The average temperatures from December 2009 through February 2010
Remember the COLD summer of 2009?