The weather observed at MADISON, WI (KMSN) at 01:53 AM CST was: The skies were cloudy. Temperature: 21F ( -6C) Dewpoint: 12F (-11C) Relative Humidity: 68% Winds from the NW (300 degs) at 9 mph. Pressure: 1019.7 millibars. Altimeter:30.08 inches of mercury. The prevailing visibility was 10 miles.