January weather in Janesville, IA
The average temperature in Janesville in January is 19.4°F (10.7°F–28.2°F). Average precipitation: 1.10 inches. Average snowfall is 10.1 inches.
January is a winter month in Janesville, and is cooler than the annual average of 49°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 12m. For travel, January is cold.
Avg High
28.2°F
Avg Low
10.7°F
Precipitation
1.10 in
Snow
10.1 in
January records in Janesville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 45.0°F (1954) | -20.7°F (2018) | 0.34 in (1965) |
| January 2 | 50.0°F (1998) | -20.7°F (2018) | 0.99 in (1966) |
| January 3 | 51.1°F (2007) | -20.7°F (2014) | 1.46 in (1971) |
| January 4 | 48.9°F (2007) | -20.9°F (1999) | 0.26 in (1971) |
| January 5 | 59.0°F (2012) | -22.0°F (1972) | 0.77 in (1989) |
| January 6 | 51.1°F (2012) | -26.0°F (1970) | 0.26 in (1995) |
| January 7 | 59.0°F (2003) | -25.1°F (1971) | 0.38 in (2016) |
| January 8 | 60.1°F (2003) | -20.0°F (1970) | 1.28 in (2026) |
| January 9 | 55.9°F (2020) | -27.0°F (1977) | 0.90 in (2024) |
| January 10 | 54.0°F (2012) | -27.0°F (1982) | 0.77 in (2017) |
| January 11 | 51.1°F (1992) | -26.0°F (1977) | 0.44 in (1960) |
| January 12 | 50.0°F (1961) | -26.0°F (1974) | 0.76 in (1960) |
| January 13 | 55.9°F (1996) | -16.8°F (2015) | 0.36 in (1979) |
| January 14 | 45.0°F (1980) | -26.0°F (1963) | 0.44 in (2022) |
| January 15 | 55.0°F (1990) | -27.9°F (1963) | 0.62 in (1952) |
| January 16 | 51.1°F (1990) | -34.1°F (2009) | 0.91 in (1980) |
| January 17 | 54.0°F (1996) | -27.9°F (1977) | 0.37 in (1996) |
| January 18 | 52.0°F (1996) | -26.0°F (1967) | 0.73 in (1996) |
| January 19 | 50.0°F (2013) | -27.9°F (1970) | 0.49 in (1988) |
| January 20 | 50.0°F (2018) | -33.0°F (1994) | 0.65 in (2012) |
| January 21 | 51.1°F (1964) | -31.0°F (1970) | 0.31 in (2007) |
| January 22 | 60.1°F (2002) | -20.0°F (1956) | 2.01 in (2018) |
| January 23 | 52.0°F (1981) | -23.1°F (1963) | 0.38 in (2010) |
| January 24 | 57.9°F (1981) | -29.0°F (2008) | 1.23 in (1967) |
| January 25 | 61.0°F (2002) | -20.0°F (1982) | 0.41 in (2017) |
| January 26 | 64.9°F (2002) | -24.0°F (1982) | 0.67 in (1996) |
| January 27 | 60.1°F (2002) | -16.8°F (2019) | 0.30 in (2019) |
| January 28 | 55.9°F (2025) | -22.0°F (1966) | 0.50 in (2013) |
| January 29 | 50.0°F (2025) | -26.0°F (1966) | 0.68 in (2001) |
| January 30 | 62.1°F (2025) | -28.8°F (2019) | 0.33 in (2013) |
| January 31 | 57.0°F (1989) | -30.8°F (2019) | 0.36 in (2002) |