Don't know if you go back that far, but how about the largest snowfall of all time for SW CT the blizzard of 1996. 27 inches reported in Darien Westport Norwalk and Fairfield.
Same happened here. Once I reached 9.5 it was compacting and melting faster than it was accumulating. It was snowing moderately and I went from 9.5 to 8 in one hour.