The weather observed at MADISON, WI (KMSN) at 12:53 AM CST was: The skies were clear. Temperature: 41F ( 5C) Dewpoint: 15F ( -9C) Relative Humidity: 34% Winds from the NW (330 degs) at 13 mph. Pressure: 1010.0 millibars. Altimeter:29.82 inches of mercury. The prevailing visibility was 10 miles.