I live in the Northeast in Pennsylvania. We're normally buried under ten feet of snow by now but today it's in the 40's which is quite warm. NYC was 45 degrees last night when the New Years Eve ball dropped and we have only had one snowstorm this winter- a month ago and it was a foot of snow that was all melted two days later. What's up with the weather? Just yesterday I saw flocks of geese flying south for the winter- they should have left over a month ago...
Regional weather variation along with a background long-term global warming signal caused by the human-induced increase in atmospheric greenhouse gas concentration.