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January to March 2012 was the warmest in US History (just barely warmer than 1921) and NOAA has discussed this endlessly.
What they are not saying is that before they tamper with the data, the same period in 2008, 2009, 2010, 2011 and 2013 were all below average.
Also note that the two coldest years (by far) were the start of the satellite record, which severely biases the satellite record to exaggerate warming.
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