December weather in Chinook, MT
The average temperature in Chinook in December is 19.0°F (7.5°F–30.5°F). Average precipitation: 0.39 inches.
December is a winter month in Chinook, and is cooler than the annual average of 42.4°F. Daily temperatures swing about 23°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 6m. For travel, December is cold.
Avg High
30.5°F
Avg Low
7.5°F
Precipitation
0.39 in
Daylight
8h 6m
December records in Chinook
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.0°F (1951) | -34.1°F (1900) | 0.35 in (1964) |
| December 2 | 66.9°F (2021) | -45.0°F (1897) | 0.27 in (1972) |
| December 3 | 64.9°F (1941) | -35.0°F (1897) | 0.50 in (1926) |
| December 4 | 66.0°F (1939) | -38.9°F (1928) | 0.74 in (1927) |
| December 5 | 70.0°F (1905) | -35.0°F (1928) | 0.41 in (1927) |
| December 6 | 64.0°F (2023) | -44.0°F (1927) | 0.57 in (1936) |
| December 7 | 57.9°F (1900) | -45.0°F (1927) | 0.17 in (1929) |
| December 8 | 62.1°F (1939) | -43.1°F (2013) | 0.37 in (1945) |
| December 9 | 64.0°F (1904) | -36.9°F (1972) | 0.40 in (1989) |
| December 10 | 69.1°F (1939) | -33.0°F (1919) | 0.99 in (1904) |
| December 11 | 63.0°F (1939) | -27.0°F (1922) | 0.80 in (2025) |
| December 12 | 60.1°F (2004) | -40.0°F (1922) | 0.32 in (1929) |
| December 13 | 59.0°F (1998) | -36.9°F (1922) | 0.40 in (2008) |
| December 14 | 66.0°F (1998) | -33.0°F (1922) | 0.35 in (1989) |
| December 15 | 64.9°F (1920) | -33.0°F (2009) | 0.25 in (1929) |
| December 16 | 64.9°F (1980) | -35.0°F (2008) | 0.96 in (1977) |
| December 17 | 60.1°F (1976) | -43.1°F (1922) | 0.30 in (1964) |
| December 18 | 61.0°F (1988) | -42.0°F (1924) | 0.22 in (1916) |
| December 19 | 61.0°F (1954) | -35.0°F (1989) | 0.21 in (1960) |
| December 20 | 66.0°F (1941) | -31.0°F (1990) | 0.37 in (1953) |
| December 21 | 61.0°F (1954) | -53.0°F (1989) | 0.34 in (1934) |
| December 22 | 60.1°F (2019) | -50.1°F (1989) | 0.99 in (1904) |
| December 23 | 59.0°F (1947) | -36.9°F (2022) | 0.99 in (1903) |
| December 24 | 54.0°F (1963) | -45.9°F (1983) | 0.99 in (1903) |
| December 25 | 60.1°F (1999) | -35.0°F (1983) | 0.42 in (1899) |
| December 26 | 69.1°F (1929) | -34.1°F (1904) | 0.20 in (1917) |
| December 27 | 63.0°F (1980) | -38.9°F (1924) | 0.94 in (2003) |
| December 28 | 59.0°F (1918) | -38.0°F (2021) | 0.49 in (1998) |
| December 29 | 63.0°F (1956) | -45.0°F (2021) | 0.31 in (1996) |
| December 30 | 60.1°F (1999) | -47.0°F (2021) | 0.68 in (1968) |
| December 31 | 60.1°F (1999) | -38.9°F (1984) | 0.99 in (1903) |