The weather observed at RALEIGH/DURHAM, NC (KRDU) at 05:51 AM EST was: The skies were clear. Temperature: 41F ( 5C) Dewpoint: 28F ( -2C) Relative Humidity: 61% Winds from the CLM(CLM degs) at 0 mph. Pressure: 1018.2 millibars. Altimeter:30.07 inches of mercury. The prevailing visibility was 10 miles.