Climate almanac
Janesville
Wisconsin, United States · 42.68°, -89.02°
What is the weather like in Janesville in January?
In January, Janesville is typically 30°F (-1°C) during the day and 17°F (-8°C) at night. The month brings about 2.2 in (55 mm) of precipitation in total. Snowfall averages about 9.5 in (241 mm) over the month.
- Average high30°F (-1°C)
- Average low17°F (-8°C)
- Precipitation2.2 in (55 mm)
- Clear or mostly clear days6
- Snowfall9.5 in (241 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)