It's strange because I only got 9.3", while Huntingtown is only a few miles north of me and got 15.5". Someone in Dunkirk reported 13" so it must have been a sharp cutoff between the northern and southern half of the county. Further south of me only reported about 6".
Zooming out at the map, it looks like a jackpot lolli than ran southwest to northeast, starting at Waldorf and ending at Northern Calvert and Southern Anne Arundel.