Climate almanac
DeKalb
Illinois, United States · 41.93°, -88.75°
What is the weather like in DeKalb in January?
In January, DeKalb is typically 31°F (-1°C) during the day and 18°F (-8°C) at night. The month brings about 2.4 in (61 mm) of precipitation in total. Snowfall averages about 9.0 in (230 mm) over the month.
- Average high31°F (-1°C)
- Average low18°F (-8°C)
- Precipitation2.4 in (61 mm)
- Clear or mostly clear days6
- Snowfall9.0 in (230 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)