January weather in Petersburg, IL
The average temperature in Petersburg in January is 25.9°F (17.3°F–34.4°F). Average precipitation: 2.02 inches. Average snowfall is 5.4 inches.
January is a winter month in Petersburg, and is cooler than the annual average of 52.3°F. Daily temperatures swing about 17.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 27m. For travel, January is cold.
Avg High
34.4°F
Avg Low
17.3°F
Precipitation
2.02 in
Snow
5.4 in
January records in Petersburg
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 59.0°F (2022) | -14.1°F (2018) | 0.70 in (2019) |
| January 2 | 52.0°F (2023) | -15.0°F (2018) | 0.60 in (2022) |
| January 3 | 59.0°F (2023) | -11.9°F (2018) | 0.48 in (2005) |
| January 4 | 66.9°F (2023) | -5.1°F (2018) | 1.89 in (1993) |
| January 5 | 51.1°F (2019) | -6.0°F (2018) | 0.62 in (1998) |
| January 6 | 57.0°F (2019) | -7.1°F (2018) | 0.69 in (2025) |
| January 7 | 52.0°F (2019) | -9.0°F (2018) | 0.60 in (1998) |
| January 8 | 64.0°F (2019) | -7.1°F (2015) | 4.43 in (2008) |
| January 9 | 62.1°F (2026) | -2.0°F (2015) | 0.78 in (2024) |
| January 10 | 55.0°F (2020) | 1.0°F (2016) | 0.22 in (2024) |
| January 11 | 57.9°F (2017) | 0.0°F (2016) | 2.61 in (2020) |
| January 12 | 61.0°F (2018) | 10.0°F (2018) | 0.71 in (2019) |
| January 13 | 48.9°F (2022) | 1.9°F (2016) | 2.25 in (2005) |
| January 14 | 53.1°F (2026) | -13.0°F (2024) | 1.36 in (1995) |
| January 15 | 52.0°F (2016) | -13.0°F (2024) | 0.56 in (2007) |
| January 16 | 48.9°F (2023) | -9.0°F (2024) | 0.18 in (1997) |
| January 17 | 55.0°F (2023) | -5.1°F (2024) | 0.34 in (1990) |
| January 18 | 51.1°F (2015) | -2.0°F (2016) | 1.28 in (2020) |
| January 19 | 46.0°F (2022) | -2.0°F (2016) | 0.98 in (2023) |
| January 20 | 50.0°F (2018) | -4.0°F (2024) | 0.16 in (2017) |
| January 21 | 52.0°F (2017) | -7.1°F (2025) | 0.97 in (1993) |
| January 22 | 63.0°F (2017) | -8.0°F (2025) | 0.78 in (2018) |
| January 23 | 60.1°F (2018) | 1.9°F (2026) | 0.90 in (2019) |
| January 24 | 43.0°F (2017) | -6.0°F (2026) | 0.56 in (2010) |
| January 25 | 48.0°F (2015) | -5.1°F (2026) | 0.82 in (1990) |
| January 26 | 55.9°F (2018) | -6.0°F (2026) | 0.78 in (2024) |
| January 27 | 55.9°F (2018) | -7.1°F (2026) | 0.18 in (1994) |
| January 28 | 53.1°F (2018) | -0.9°F (2026) | 0.45 in (1994) |
| January 29 | 53.1°F (2023) | 1.0°F (2026) | 1.31 in (2001) |
| January 30 | 50.0°F (2025) | -15.0°F (2019) | 1.51 in (2013) |
| January 31 | 52.0°F (2016) | -16.1°F (2019) | 1.66 in (2002) |