This photo was taken on Dec 15th in South Philly, right in front of the cheese steak houses on Passyunk. In fact, many of the street trees in that area are blooming in this fashion. 2 weeks later we continue to have 50 degree days.
Obviously, there is a warming trend. I remember just a few years ago becoming alarmed seeing trees with buds in the winter. I guess when leaves start coming out, I will truly be worried.