January weather in Alton, MO
The average temperature in Alton in January is 33.1°F (22.4°F–43.8°F). Average precipitation: 2.96 inches. Average snowfall is 1.7 inches.
January is a winter month in Alton, and is cooler than the annual average of 55.7°F. Daily temperatures swing about 21.4°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 9h 45m. For travel, January is cold.
Avg High
43.8°F
Avg Low
22.4°F
Precipitation
2.96 in
Snow
1.7 in
January records in Alton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 68.0°F (2000) | -0.9°F (1977) | 3.36 in (1966) |
| January 2 | 66.9°F (2000) | -0.9°F (2001) | 2.00 in (1966) |
| January 3 | 71.1°F (1997) | -0.9°F (2001) | 2.50 in (1951) |
| January 4 | 72.0°F (2004) | 1.0°F (2001) | 1.29 in (2019) |
| January 5 | 73.9°F (1997) | 0.0°F (1999) | 2.34 in (1998) |
| January 6 | 66.9°F (1965) | -0.9°F (2014) | 0.78 in (2025) |
| January 7 | 73.9°F (1965) | -6.0°F (1970) | 0.61 in (2010) |
| January 8 | 68.0°F (2008) | -6.0°F (1970) | 0.77 in (2018) |
| January 9 | 72.0°F (2006) | 0.0°F (1976) | 0.97 in (2024) |
| January 10 | 71.1°F (2002) | -9.0°F (1982) | 1.75 in (1975) |
| January 11 | 64.9°F (2000) | -18.0°F (1977) | 2.13 in (2020) |
| January 12 | 71.1°F (1995) | -6.0°F (1977) | 1.55 in (2024) |
| January 13 | 71.1°F (1995) | -0.9°F (1963) | 1.30 in (1951) |
| January 14 | 70.0°F (2026) | -5.1°F (1982) | 1.26 in (2007) |
| January 15 | 70.0°F (1996) | -5.1°F (1982) | 1.74 in (2007) |
| January 16 | 70.0°F (1974) | -9.9°F (1982) | 0.70 in (1978) |
| January 17 | 66.9°F (2000) | -15.0°F (1977) | 1.10 in (1969) |
| January 18 | 66.9°F (1974) | -6.0°F (1997) | 1.25 in (1971) |
| January 19 | 66.0°F (1974) | -8.0°F (1977) | 0.92 in (2023) |
| January 20 | 68.0°F (1964) | 3.0°F (2025) | 0.96 in (1974) |
| January 21 | 69.1°F (1964) | 1.9°F (1970) | 1.26 in (1973) |
| January 22 | 72.0°F (1967) | 5.0°F (1977) | 2.12 in (1999) |
| January 23 | 75.0°F (1967) | -6.0°F (1963) | 1.42 in (2024) |
| January 24 | 75.9°F (2002) | -9.0°F (1963) | 1.63 in (2002) |
| January 25 | 69.1°F (1981) | -5.1°F (2014) | 1.19 in (2021) |
| January 26 | 68.0°F (1964) | -2.0°F (2026) | 0.69 in (1967) |
| January 27 | 62.1°F (1999) | -0.9°F (1963) | 2.09 in (2009) |
| January 28 | 73.9°F (1970) | -5.1°F (1963) | 1.31 in (2009) |
| January 29 | 73.9°F (2002) | -2.9°F (1966) | 1.00 in (1968) |
| January 30 | 73.0°F (2002) | -2.9°F (1966) | 3.62 in (1969) |
| January 31 | 69.1°F (1967) | -2.0°F (1977) | 3.75 in (1982) |