Climate almanac
Eureka
Illinois, United States · 40.72°, -89.27°
What is the weather like in Eureka in January?
In January, Eureka is typically 34°F (1°C) during the day and 21°F (-6°C) at night. The month brings about 2.3 in (59 mm) of precipitation in total. Snowfall averages about 6.8 in (172 mm) over the month.
- Average high34°F (1°C)
- Average low21°F (-6°C)
- Precipitation2.3 in (59 mm)
- Clear or mostly clear days7
- Snowfall6.8 in (172 mm)
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)