Surface observations

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

The weather observed at WASHINGTON DC, VA (KDCA) at 04:52 PM EST was:
  The skies were mostly clear.
  Temperature: 45F (  7C)  Dewpoint:  21F ( -6C)  Relative Humidity:  39%
  Winds from the NW (330 degs) at 12 mph.
  Pressure: 1021.6 millibars.  Altimeter:30.17 inches of mercury.
  The prevailing visibility was 10 miles.