The climate is clearly doing some weird things, besides just warming up and has been evident for quite some time. The planet's "natural" defense against warming might be to try and refreeze the poles which might be what we are seeing from time to time (clearly bad for those who like snow here in New England), but obviously that has been trumped by crazy amount of warming that is happening. I see it as the planet releasing antibodies to help fight an infection that it has and helping to return it back to its natural state. In this case it is trying to fight something that it most likely won't be able to defeat. Just my 2 cents...
Long story short, winter seasons like this year and last, and 2011/2012 may become a more common occurrence as we go along. Not that blockbusters won't occur, they will probably occur more often than not (extremes will become more normal on both ends of the spectrum), until the snow just disappears completely around these areas and we all look like great plains during the dust bowl era...