December weather in Grass Range, MT
The average temperature in Grass Range in December is 26.4°F (15.2°F–37.7°F). Average precipitation: 0.55 inches. Average snowfall is 8.8 inches.
December is a winter month in Grass Range, and is cooler than the annual average of 45.5°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 19m. For travel, December is cold.
Avg High
37.7°F
Avg Low
15.2°F
Precipitation
0.55 in
Snow
8.8 in
December records in Grass Range
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1988) | -18.0°F (1985) | 0.48 in (1982) |
| December 2 | 66.0°F (1959) | -27.0°F (1985) | 0.37 in (1977) |
| December 3 | 66.9°F (1987) | -17.0°F (1972) | 0.56 in (2017) |
| December 4 | 68.0°F (1988) | -23.1°F (1972) | 0.65 in (1978) |
| December 5 | 78.1°F (1939) | -23.1°F (1956) | 0.27 in (1989) |
| December 6 | 68.0°F (1939) | -31.0°F (1956) | 0.30 in (1986) |
| December 7 | 63.0°F (1939) | -29.0°F (2013) | 0.53 in (1958) |
| December 8 | 66.0°F (1940) | -36.0°F (1972) | 0.17 in (1950) |
| December 9 | 66.9°F (1975) | -29.0°F (1977) | 0.20 in (2000) |
| December 10 | 64.0°F (1939) | -16.1°F (1972) | 0.40 in (1949) |
| December 11 | 68.0°F (1939) | -23.1°F (1961) | 0.30 in (1949) |
| December 12 | 64.0°F (1962) | -18.9°F (1949) | 0.60 in (1937) |
| December 13 | 63.0°F (1960) | -14.1°F (1972) | 0.44 in (2008) |
| December 14 | 64.9°F (1997) | -20.0°F (1951) | 0.80 in (2015) |
| December 15 | 69.1°F (1962) | -25.1°F (1945) | 0.45 in (1989) |
| December 16 | 66.9°F (1980) | -31.0°F (1964) | 0.21 in (1963) |
| December 17 | 66.9°F (1976) | -27.0°F (2016) | 0.20 in (1951) |
| December 18 | 66.9°F (1979) | -29.0°F (1955) | 0.30 in (1951) |
| December 19 | 66.0°F (2004) | -22.0°F (1990) | 0.27 in (2013) |
| December 20 | 64.9°F (1941) | -27.0°F (1951) | 0.30 in (2010) |
| December 21 | 64.9°F (1954) | -36.9°F (1989) | 0.49 in (1966) |
| December 22 | 60.1°F (1940) | -36.9°F (1989) | 0.13 in (1973) |
| December 23 | 61.0°F (1936) | -24.0°F (1983) | 0.63 in (1955) |
| December 24 | 63.0°F (1999) | -38.9°F (1983) | 1.00 in (1984) |
| December 25 | 60.1°F (1947) | -20.0°F (1983) | 0.56 in (1990) |
| December 26 | 64.0°F (1980) | -29.9°F (1983) | 0.92 in (2003) |
| December 27 | 66.9°F (1980) | -22.0°F (1965) | 0.20 in (1971) |
| December 28 | 62.1°F (1956) | -31.0°F (1984) | 0.28 in (1990) |
| December 29 | 68.0°F (1956) | -36.0°F (1968) | 0.68 in (2010) |
| December 30 | 63.0°F (1980) | -32.1°F (1968) | 0.46 in (1977) |
| December 31 | 59.0°F (1963) | -26.0°F (1992) | 0.25 in (1964) |