The official thermometer at BWI-Marshall touched 30 degrees overnight, marking the first low below the freezing point since March 27.
It was 27 degrees out on the WeatherDeck in Cockeysville before sunrise, and 36 at The Sun's weather station at Calvert and Centre streets.
Here are some other overnight lows as reported this morning by the NWS:
Washington National: 39 degrees
Dulles International: 31 degrees
Annapolis: 39 degrees
Hagerstown: 30 degrees
Martin State Airport: 32 degrees
Frederick Airport: 27 degrees
Martinsburg, WV: 27 degrees
Ocean City: 36 degrees
The rest of the week's forecast calls for the overnight lows to moderate to the upper 30s and low 40s, with daytime highs in the 50s. There's some significant rain in the cards for late Wednesday, Thursday and Friday, with as much as a half to three-quarters of an inch possible. But then skies should clear for a cool but sunny weekend.
(PHOTO: NASA, 11/1/10)