Climate almanac
Rock Falls
Illinois, United States · 41.78°, -89.69°
What is the weather like in Rock Falls in January?
In January, Rock Falls is typically 31°F (0°C) during the day and 18°F (-8°C) at night. The month brings about 2.3 in (59 mm) of precipitation in total. Snowfall averages about 8.3 in (210 mm) over the month.
- Average high31°F (0°C)
- Average low18°F (-8°C)
- Precipitation2.3 in (59 mm)
- Clear or mostly clear days7
- Snowfall8.3 in (210 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)