Climate almanac
Waterloo
Illinois, United States · 38.34°, -90.15°
What is the weather like in Waterloo in December?
In December, Waterloo is typically 48°F (9°C) during the day and 33°F (0°C) at night. The month brings about 2.7 in (69 mm) of precipitation in total. Snowfall averages about 1.1 in (28 mm) over the month.
- Average high48°F (9°C)
- Average low33°F (0°C)
- Precipitation2.7 in (69 mm)
- Clear or mostly clear days9
- Snowfall1.1 in (28 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)