Milwaukee, Wisconsin weather in December

Averages from 2021–2025 (155 days of record).

Average high: 37°F
Average low: 24°F
Rainy days: ~9 per month
Total precipitation: 2.0 in
Warmest recorded: 65°F
Coldest recorded: -10°F

Expect December days in Milwaukee, Wisconsin to top out around 37°F and cool to about 24°F overnight, with roughly 9 days of measurable rain across the month. In recent years December has ranged from -10°F to 65°F.

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Current Milwaukee, Wisconsin forecast → · Historical data by Open-Meteo (ERA5).