The weather observed at WASHINGTON DC, VA (KDCA) at 01:52 AM EDT was: The skies were mostly clear. Temperature: 74F ( 23C) Dewpoint: 59F ( 15C) Relative Humidity: 60% Winds from the CLM(CLM degs) at 0 mph. Pressure: 1020.1 millibars. Altimeter:30.13 inches of mercury. The prevailing visibility was 10 miles. The maximum temperature in the past 6 hours was 80F. The minimum temperature in the past 6 hours was 73F.