Some precip records for BWI:
Wettest September ever 13.32" in 2011.
August-September 2011- first ever back-to-back months with double-digit precip totals.
9/30/10 - 6.02 inches of rain, setting a daily and monthly record. This was also the 2nd wettest day recorded in BWI ever.
I'll leave the snow records (or lack thereof) to someone else, they're easy pickings :-)