>> go giants! go blue. >> reporter: in fact, the national climatic data center says there's no correlation between groundhog predictions and the actual weather. because if there were the groundhogs would know spring kind of started already. >> part of me is like is this real? >> reporter: yes, those are real cherry blossoms in washington, d.c. and yes, this really has been the warmest winter for much of the u.s. in more than 40 years. but it's been a brutal winter in europe, where the cold has killed more than 100 people and temperatures have plunged to historic lows. overnight in denver they say there could be as much snow as the city typically sees in one full winter month. groundhogs in denver won't be >> because so many people