That was a backloaded winter if anything, which is typical of weak El Ninos.
DCA temps and snowfall by month:
DEC: +0.4 (0.1")
JAN: +0.1 (6.4")
FEB: +0.6 (5.2")
MAR: -3.7 (0.8")
Big storms that winter were the KU in January 2005 and back to back coastal storms in late Feb. January 2005 was a classic Miller B screwjob for the DC/Baltimore metro that crushed everyone north and east of Cecil. February 24-25 was a fast moving coastal that brought a wide swath of 6+" to Maryland east of DC although DC itself was a relative min. I don't recall the exact details of February 28-March 1, but I believe this was a storm where the primary low redeveloped too late, which kept the heaviest the snow well north and east of the metro.
So as a result, it ended up being an average winter for DC and Baltimore, above average for Philly and NYC, and an all timer for Long Island and SNE including Boston.