December in Madison averages a daily high of 0.9°C with nights around -8.2°C. Expect roughly 8.4 wet days totalling 49mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Madison is June–September.
Based on UW ARBORETUM MADISON, WI US (4.2km), 1995–2024. 28 years of December data.