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 10:52 PM EST was:
  The skies were mostly cloudy.
  Temperature: 45F (  7C)  Dewpoint:  25F ( -4C)  Relative Humidity:  45%
  Winds from the NW (330 degs) at 16 mph.
  Pressure: 1010.3 millibars.  Altimeter:29.84 inches of mercury.
  The prevailing visibility was 10 miles.