Climate almanac
Janesville
Wisconsin, United States · 42.68°, -89.02°
What is the weather like in Janesville in December?
In December, Janesville is typically 35°F (2°C) during the day and 23°F (-5°C) at night. The month brings about 2.1 in (53 mm) of precipitation in total. Snowfall averages about 6.1 in (154 mm) over the month.
- Average high35°F (2°C)
- Average low23°F (-5°C)
- Precipitation2.1 in (53 mm)
- Clear or mostly clear days5
- Snowfall6.1 in (154 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)