This is certainly not true for us here on the west. We are seeing very warm temps and blossoms already. Might be true on the northeast but ya know 6 weeks isn't really that long anyway!
http://www.washingtonpost.com/blogs/capital-weather-gang/wp/2015/02/02/groundhog-day-2015-punxsutawney-phil-sees-shadow-predicts-six-more-weeks-of-winter/