January weather in Romeoville, IL
The average temperature in Romeoville in January is 23.9°F (16.1°F–31.7°F). Average precipitation: 2.19 inches. Average snowfall is 10.6 inches.
January is a winter month in Romeoville, and is cooler than the annual average of 50.9°F. Daily temperatures swing about 15.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 18m. For travel, January is cold.
Avg High
31.7°F
Avg Low
16.1°F
Precipitation
2.19 in
Snow
10.6 in
January records in Romeoville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 50.0°F (2000) | -14.1°F (2018) | 1.08 in (2005) |
| January 2 | 61.0°F (2000) | -16.1°F (2018) | 1.39 in (1999) |
| January 3 | 57.0°F (1998) | -11.0°F (2014) | 0.94 in (2023) |
| January 4 | 55.0°F (1998) | -14.1°F (1999) | 1.67 in (2007) |
| January 5 | 55.9°F (1998) | -22.0°F (1999) | 0.65 in (2005) |
| January 6 | 61.0°F (2008) | -17.0°F (2014) | 0.20 in (1998) |
| January 7 | 64.9°F (2008) | -14.1°F (2014) | 0.48 in (2008) |
| January 8 | 59.0°F (2026) | -9.9°F (2015) | 1.94 in (2026) |
| January 9 | 59.0°F (2026) | -9.9°F (1999) | 0.85 in (2024) |
| January 10 | 54.0°F (2018) | -9.0°F (2010) | 0.97 in (2014) |
| January 11 | 57.9°F (2018) | -4.0°F (1999) | 0.62 in (2020) |
| January 12 | 63.0°F (2005) | 1.0°F (2016) | 0.86 in (2024) |
| January 13 | 48.9°F (2005) | -6.0°F (2009) | 0.85 in (2005) |
| January 14 | 44.1°F (2016) | -13.9°F (2024) | 0.62 in (2007) |
| January 15 | 44.1°F (2000) | -20.9°F (2009) | 0.18 in (2007) |
| January 16 | 51.1°F (2023) | -24.0°F (2009) | 0.63 in (2017) |
| January 17 | 45.0°F (2025) | -4.0°F (2018) | 0.44 in (1999) |
| January 18 | 44.1°F (2022) | -4.0°F (2016) | 0.44 in (2020) |
| January 19 | 57.0°F (2006) | -4.0°F (2008) | 0.57 in (2017) |
| January 20 | 46.9°F (2006) | -6.0°F (2008) | 0.88 in (2006) |
| January 21 | 59.0°F (2017) | -9.9°F (2000) | 1.08 in (1999) |
| January 22 | 55.0°F (2002) | -5.1°F (2014) | 0.78 in (2018) |
| January 23 | 48.9°F (2002) | -11.0°F (2014) | 0.72 in (1999) |
| January 24 | 46.0°F (2010) | -11.0°F (2000) | 0.45 in (2010) |
| January 25 | 51.1°F (2002) | -8.0°F (2008) | 0.30 in (2023) |
| January 26 | 55.0°F (2002) | -13.9°F (2022) | 0.26 in (2024) |
| January 27 | 60.1°F (2002) | -11.9°F (2014) | 0.20 in (2004) |
| January 28 | 55.9°F (2002) | -15.0°F (2014) | 0.57 in (2006) |
| January 29 | 62.1°F (2013) | -9.9°F (2019) | 1.15 in (2013) |
| January 30 | 53.1°F (2012) | -23.1°F (2019) | 0.72 in (2002) |
| January 31 | 57.0°F (2012) | -24.0°F (2019) | 0.63 in (2002) |