January weather in Boulder, MT
The average temperature in Boulder in January is 23.5°F (11.9°F–35.0°F). Average precipitation: 0.28 inches.
January is a winter month in Boulder, and is cooler than the annual average of 42.6°F. Daily temperatures swing about 23.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 48m. For travel, January is cold.
Avg High
35.0°F
Avg Low
11.9°F
Precipitation
0.28 in
Daylight
8h 48m
January records in Boulder
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 55.0°F (1964) | -24.0°F (1952) | 0.38 in (1997) |
| January 2 | 51.1°F (1964) | -29.0°F (1968) | 0.39 in (1972) |
| January 3 | 48.0°F (2007) | -29.9°F (1950) | 0.42 in (1966) |
| January 4 | 54.0°F (2012) | -27.0°F (1972) | 0.12 in (1969) |
| January 5 | 54.0°F (2001) | -35.0°F (2004) | 0.46 in (1968) |
| January 6 | 54.0°F (2001) | -32.1°F (2004) | 1.40 in (2022) |
| January 7 | 54.0°F (2002) | -27.0°F (1979) | 0.20 in (1962) |
| January 8 | 51.1°F (2002) | -24.0°F (1973) | 0.23 in (1962) |
| January 9 | 55.0°F (1953) | -29.9°F (1973) | 0.28 in (1971) |
| January 10 | 51.1°F (1990) | -34.1°F (1962) | 0.22 in (1971) |
| January 11 | 55.9°F (1983) | -33.0°F (1963) | 0.13 in (2006) |
| January 12 | 55.9°F (1983) | -35.0°F (1963) | 0.18 in (1972) |
| January 13 | 55.0°F (2026) | -26.0°F (1971) | 0.39 in (2005) |
| January 14 | 57.9°F (2026) | -29.0°F (2024) | 0.30 in (1967) |
| January 15 | 53.1°F (1973) | -33.0°F (2024) | 0.35 in (1977) |
| January 16 | 52.0°F (1961) | -24.0°F (1987) | 0.39 in (1956) |
| January 17 | 53.1°F (2009) | -23.1°F (1954) | 0.24 in (1953) |
| January 18 | 59.0°F (2026) | -25.1°F (1984) | 0.32 in (1975) |
| January 19 | 57.9°F (2005) | -36.0°F (1963) | 0.13 in (1977) |
| January 20 | 55.9°F (2005) | -36.9°F (1954) | 0.29 in (1964) |
| January 21 | 52.0°F (1950) | -33.0°F (1962) | 0.50 in (1969) |
| January 22 | 51.1°F (1994) | -33.0°F (1962) | 0.50 in (2010) |
| January 23 | 51.1°F (1959) | -35.0°F (1963) | 0.27 in (1982) |
| January 24 | 57.9°F (1968) | -33.0°F (1969) | 0.15 in (1970) |
| January 25 | 53.1°F (2014) | -35.0°F (1949) | 0.50 in (2025) |
| January 26 | 55.0°F (2015) | -38.0°F (1957) | 0.60 in (1975) |
| January 27 | 57.0°F (1988) | -32.1°F (1957) | 0.22 in (1965) |
| January 28 | 53.1°F (1971) | -29.9°F (1980) | 0.40 in (1965) |
| January 29 | 54.0°F (1962) | -29.0°F (1951) | 0.09 in (1978) |
| January 30 | 57.9°F (1989) | -33.0°F (1996) | 0.50 in (1975) |
| January 31 | 57.0°F (1962) | -27.9°F (1975) | 0.20 in (1957) |