Climate almanac
Olney
Illinois, United States · 38.73°, -88.09°
What is the weather like in Olney in December?
In December, Olney is typically 46°F (8°C) during the day and 32°F (0°C) at night. The month brings about 3.4 in (87 mm) of precipitation in total. Snowfall averages about 1.8 in (45 mm) over the month.
- Average high46°F (8°C)
- Average low32°F (0°C)
- Precipitation3.4 in (87 mm)
- Clear or mostly clear days7
- Snowfall1.8 in (45 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)