A recent report by the National Arbor Day Foundation vividly describes the dramatic increase in average annual winter temperature throughout the U.S. They compared average annual winter temperatures in 1990 over a fifteen year period with those in 2006.
Here’s what they found:

That’s right: it is getting warmer everywhere in the U.S. The annual average low in Boston increased between 115-29 degrees Fahrenheit (unfortunately, the map is only in gradations of ten degrees). But I guess global warming is just a ‘theory’…