Source here. (click on image to enlarge)
This chart represents the 15 years (180 months), starting May 1, 1997 and ending April 30, 2011. Per the latest NOAA/NCDC U.S. temperature data records, the 12-month period ending April was the 5th coldest April-ending period for the last 15 years. In terms of a single month, April 2011 was 79th coldest April in the past 117 years.
The per century cooling trend of this period, a minus 3.2°F, took place in spite of the huge warmth produced by two large El Niño events during this 15-year span: 1997-1998 and 2009-2010.
For the 10-year period ending April 2011, the cooling trend accelerates to a very significant minus 12.9°F per century rate - again, per the updated NOAA/NCDC temperature records. (click on image to enlarge)
At some point, U.S. continental warming will resume, but the extended decade-long plus global cooling trend persists, contradicting the experts. None of the IPCC climate models, nor "consensus" experts predicted this cooling trend for the continental U.S.