December in Milwaukee averages a daily high of 2°C with nights around -5°C. Expect roughly 10.4 wet days totalling 49.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Milwaukee is June–September.
Based on MILWAUKEE MITCHELL AIRPORT, WI US (9.3km), 1995–2024. 30 years of December data.