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.