The weather observed at MADISON, WI (KMSN) at 02:53 AM CDT was: The skies were clear. Temperature: 64F ( 18C) Dewpoint: 60F ( 16C) Relative Humidity: 87% Winds from the WNW(290 degs) at 5 mph. Pressure: 1014.2 millibars. Altimeter:29.97 inches of mercury. The prevailing visibility was 10 miles.