January weather in Thomson, IL
The average temperature in Thomson in January is 21.4°F (13.6°F–29.3°F). Average precipitation: 1.40 inches.
January is a winter month in Thomson, and is cooler than the annual average of 49.9°F. Daily temperatures swing about 15.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 16m. For travel, January is cold.
Avg High
29.3°F
Avg Low
13.6°F
Precipitation
1.40 in
Daylight
9h 16m
January records in Thomson
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 52.0°F (2007) | -16.1°F (2018) | 0.72 in (2019) |
| January 2 | 52.0°F (1950) | -16.1°F (2018) | 0.95 in (1965) |
| January 3 | 55.0°F (2004) | -15.0°F (1979) | 0.42 in (2023) |
| January 4 | 57.0°F (1998) | -18.9°F (1999) | 1.28 in (1971) |
| January 5 | 61.0°F (1997) | -23.1°F (1999) | 1.20 in (1946) |
| January 6 | 53.1°F (2012) | -23.1°F (1999) | 0.43 in (1995) |
| January 7 | 57.9°F (2008) | -17.0°F (1942) | 0.49 in (2019) |
| January 8 | 60.1°F (2008) | -20.0°F (1942) | 0.25 in (2019) |
| January 9 | 59.0°F (2026) | -11.9°F (1979) | 0.82 in (1946) |
| January 10 | 57.9°F (2003) | -18.9°F (1942) | 1.02 in (2024) |
| January 11 | 55.0°F (1975) | -18.9°F (1979) | 0.73 in (2020) |
| January 12 | 53.1°F (1960) | -15.0°F (1977) | 1.42 in (1960) |
| January 13 | 55.0°F (1960) | -14.1°F (1974) | 1.10 in (1966) |
| January 14 | 50.0°F (1952) | -18.0°F (1957) | 0.70 in (1995) |
| January 15 | 54.0°F (1953) | -23.1°F (1979) | 0.90 in (1960) |
| January 16 | 54.0°F (1973) | -33.0°F (2009) | 0.79 in (1969) |
| January 17 | 54.0°F (1990) | -22.0°F (1977) | 1.00 in (2017) |
| January 18 | 55.9°F (1996) | -20.0°F (1994) | 0.35 in (1953) |
| January 19 | 50.0°F (1981) | -22.0°F (1994) | 0.84 in (1973) |
| January 20 | 55.9°F (1998) | -23.1°F (1985) | 1.43 in (1995) |
| January 21 | 59.0°F (1957) | -20.0°F (1985) | 0.50 in (2014) |
| January 22 | 57.0°F (1964) | -18.9°F (2011) | 1.10 in (1999) |
| January 23 | 55.0°F (2002) | -20.0°F (1963) | 0.94 in (1965) |
| January 24 | 62.1°F (1950) | -13.0°F (1963) | 1.46 in (2010) |
| January 25 | 60.1°F (1967) | -22.0°F (2008) | 0.79 in (2010) |
| January 26 | 62.1°F (1981) | -23.1°F (2008) | 0.58 in (1990) |
| January 27 | 61.0°F (1944) | -22.0°F (2019) | 1.02 in (1974) |
| January 28 | 61.0°F (2002) | -20.9°F (1963) | 0.80 in (1949) |
| January 29 | 57.9°F (2013) | -18.9°F (1966) | 0.91 in (2006) |
| January 30 | 60.1°F (2013) | -24.0°F (2019) | 1.55 in (1947) |
| January 31 | 55.9°F (1988) | -27.0°F (2019) | 0.42 in (2025) |