If you're looking for a better stretch of below normal months at BWI (using the 1981-2010 normals), the most recent one I could find was the period between Jan. 2003 - Feb. 2004, which had 10 out of 14 months below normal. An even more impressive stretch would be the period between Oct. 2002 - Feb. 2004, which had 13 of 17 months below normal.
Also, the period between Jan. 2009 - Feb. 2010 had 9 of 14 months below normal.
By the way 2003, as a calendar year, actually finished colder than 2014- 2003 finished 13th coldest, whereas 2014 finished tied for 14th coldest.