December weather in Chester, MT
The average temperature in Chester in December is 18.6°F (5.6°F–31.6°F). Average precipitation: 0.56 inches. Average snowfall is 6.3 inches.
December is a winter month in Chester, and is cooler than the annual average of 41.4°F. Daily temperatures swing about 26°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
31.6°F
Avg Low
5.6°F
Precipitation
0.56 in
Snow
6.3 in
December records in Chester
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 68.0°F (1913) | -33.0°F (1985) | 0.39 in (1964) |
| December 2 | 71.1°F (1913) | -35.0°F (1985) | 0.53 in (2025) |
| December 3 | 66.0°F (1913) | -27.9°F (1970) | 0.34 in (1966) |
| December 4 | 68.0°F (1913) | -36.9°F (1972) | 0.21 in (2021) |
| December 5 | 63.0°F (2023) | -29.9°F (1950) | 0.21 in (2025) |
| December 6 | 62.1°F (2023) | -38.0°F (1972) | 0.30 in (1977) |
| December 7 | 60.1°F (2023) | -40.0°F (2013) | 0.28 in (1958) |
| December 8 | 61.0°F (1913) | -44.0°F (1972) | 0.22 in (1963) |
| December 9 | 59.0°F (1979) | -38.0°F (1977) | 0.27 in (1989) |
| December 10 | 60.1°F (1913) | -32.1°F (1961) | 0.35 in (1953) |
| December 11 | 57.0°F (1913) | -33.0°F (1961) | 0.25 in (2025) |
| December 12 | 57.9°F (1913) | -32.1°F (1961) | 0.25 in (1958) |
| December 13 | 57.9°F (1998) | -29.9°F (1963) | 0.70 in (2025) |
| December 14 | 57.9°F (1998) | -27.9°F (1948) | 0.20 in (1989) |
| December 15 | 61.0°F (1962) | -32.1°F (2009) | 0.21 in (1984) |
| December 16 | 63.0°F (1980) | -35.0°F (1979) | 0.26 in (1970) |
| December 17 | 59.0°F (1980) | -42.0°F (1964) | 0.25 in (1951) |
| December 18 | 54.0°F (1954) | -38.9°F (2016) | 0.38 in (2017) |
| December 19 | 57.9°F (2004) | -29.0°F (1983) | 0.26 in (1960) |
| December 20 | 55.9°F (1954) | -32.1°F (1949) | 0.21 in (2010) |
| December 21 | 57.9°F (1954) | -42.0°F (1989) | 0.41 in (1966) |
| December 22 | 80.1°F (1915) | -44.0°F (1990) | 0.33 in (1964) |
| December 23 | 55.9°F (2023) | -44.0°F (2022) | 0.41 in (2008) |
| December 24 | 52.0°F (1913) | -52.1°F (1983) | 0.21 in (2017) |
| December 25 | 54.0°F (1947) | -42.0°F (1983) | 0.49 in (2016) |
| December 26 | 55.0°F (1980) | -42.0°F (1916) | 0.50 in (1904) |
| December 27 | 55.9°F (1980) | -36.0°F (1916) | 0.19 in (2021) |
| December 28 | 61.0°F (1956) | -34.1°F (1916) | 0.43 in (2006) |
| December 29 | 63.0°F (1956) | -45.0°F (1968) | 0.35 in (1996) |
| December 30 | 53.1°F (2011) | -35.0°F (1968) | 0.45 in (2010) |
| December 31 | 52.0°F (1963) | -36.0°F (1992) | 0.28 in (2013) |