Climate almanac
DeKalb
Illinois, United States · 41.93°, -88.75°
What is the weather like in DeKalb in December?
In December, DeKalb is typically 37°F (3°C) during the day and 25°F (-4°C) at night. The month brings about 2.1 in (54 mm) of precipitation in total. Snowfall averages about 4.4 in (111 mm) over the month.
- Average high37°F (3°C)
- Average low25°F (-4°C)
- Precipitation2.1 in (54 mm)
- Clear or mostly clear days6
- Snowfall4.4 in (111 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)