There's 39 total, 12 inch or greater storms in Central Park and 8 from Mid February (15th) through March. The most recent is is Feb 25 2010 20.9 inches that you noted, Feb 19, 1979 12.7 inches, Feb 20, 1921 12.5 inches and 5 in March. Not as many as I thought there would be so it does show how difficult it is for the City to get a blockbuster this time of year.