Climate almanac
Chillicothe
Illinois, United States · 40.92°, -89.49°
What is the weather like in Chillicothe in December?
In December, Chillicothe is typically 40°F (5°C) during the day and 26°F (-3°C) at night. The month brings about 2.2 in (57 mm) of precipitation in total. Snowfall averages about 2.7 in (68 mm) over the month.
- Average high40°F (5°C)
- Average low26°F (-3°C)
- Precipitation2.2 in (57 mm)
- Clear or mostly clear days7
- Snowfall2.7 in (68 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)