December in Appleton averages a daily high of -0.5°C with nights around -8.1°C. Expect roughly 10.3 wet days totalling 45.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Appleton is May–September.
Based on APPLETON, WI US (2.4km), 1995–2024. 30 years of December data.