This is weird. This is not good," says one climate scientist. Among the "weird" stats:

The average temperature in March was 51.1 degrees this year, when it's normally 42.5 degrees.
Records are usually broken by a tenth or two of a degree; 2012 busted the January-March record by 1.4 degrees.
At least 7,775 weather stations broke daily high records in March.
International Falls, Minn., (aka the "icebox of America") saw temperatures in the 70s for five days in March; there were only three days below zero all month.
The warmer-than-usual temperatures go all the way back to the summer of 2011.
Interestingly, however, this winter's strange warmth has been mostly limited to North America.

2012 Obliterating US Heat Records

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If you found yourself thinking last month, "Wow, it's awfully hot for March," you weren't wrong. Temperatures were 8.6 degrees higher than normal last month in the contiguous US, and... Science News Summaries. | Newser