April 2014 ranked the 5th wettest April on record at Washington National Airport (DCA) with two-day rainfall totals (April 29th – 30th) running 3.91 inches.
At BWI Airport, April 2014 was the 2nd wettest on record with two-day rainfall totals running 4.30 inches!
Lastly, Dulles International Airport (IAD) recorded an incredible 5.18″ of rain (April 29th – 30th) making it the wettest April on record (records date back to 1962).
DC Storms 
Pretty amazing April event, seemed more like a tropical system in August or September.