With days to go, this is already one of the wettest Mays since record-keeping began here in 1871. The airport total through Tuesday was 7.1 inches, drowning the long-term average of 3.89 inches. The record is 8.71 inches, set in 1989. The second-wettest was just last year, when 7.77 inches fell at BWI. The third-wettest was 7.26 inches in 1894. This month's dunking has tied with May 1960 for fourth place.