Surface observations

Data from the National Weather Service, made available here by the UAlbany Department of Earth and Atmospheric Sciences

The weather observed at WASHINGTON DC, VA (KDCA) at 02:52 AM EST was:
  The skies were cloudy.
  Temperature: 52F ( 11C)  Dewpoint:  37F (  3C)  Relative Humidity:  58%
  Winds from the N  (350 degs) at 10 mph.
  Pressure: 1008.2 millibars.  Altimeter:29.77 inches of mercury.
  The prevailing visibility was 10 miles.