The weather observed at MADISON, WI (KMSN) at 02:53 AM CDT was: The skies were clear. Temperature: 57F ( 14C) Dewpoint: 54F ( 12C) Relative Humidity: 88% Winds from the SW (230 degs) at 3 mph. Pressure: 1002.6 millibars. Altimeter:29.61 inches of mercury. The prevailing visibility was 10 miles.