D.C and Baltimore's latest snowfall was both on April 28, 1898, where 0.5'' of snow fell in DC, and 0.1'' fell in Baltimore.
On August 19, the sun will be at the same strength as it is on April 28 of any year.
I think the rain today is done with for my area and NW after 3 PM based on radar OBS. Yes it is moving parallel to me but it has the slight SE push to it. SE MD might not be out of the action until late tonight.