The weather observed at CHICAGO O'HARE, IL (KORD) at 05:51 PM CDT was: The skies were partly cloudy. Temperature: 79F ( 26C) Dewpoint: 62F ( 17C) Relative Humidity: 56% Winds from the E (080 degs) at 8 mph. Pressure: 1017.0 millibars. Altimeter:30.04 inches of mercury. The prevailing visibility was 10 miles.