|Temperature anomalies for Jan 2011 based on comparison to 1951-1980 trends (click to enlarge).|
This in turn has pushed the cold winter air that forms in the polar regions towards the mid-latitudes.
Not surprising, as 2010 tied with 2005 as the warmest year on record. But maybe its all due to high solar activity, which is reflected by sunspot abundance. Let' see:
|Monthly sunspot numbers since 1750, from Solar Physics, Marshall Space Flight Center (click for larger image).|
BTW: It may hit 65 F here in SE Pennsylvania this Friday.