Climate almanac
Jacksonville
Illinois, United States · 39.73°, -90.23°
What is the weather like in Jacksonville in December?
In December, Jacksonville is typically 44°F (7°C) during the day and 29°F (-2°C) at night. The month brings about 2.1 in (53 mm) of precipitation in total. Snowfall averages about 1.8 in (45 mm) over the month.
- Average high44°F (7°C)
- Average low29°F (-2°C)
- Precipitation2.1 in (53 mm)
- Clear or mostly clear days8
- Snowfall1.8 in (45 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)