December weather in Ennis, MT
The average temperature in Ennis in December is 23.8°F (14.5°F–33.2°F). Average precipitation: 0.54 inches. Average snowfall is 7.3 inches.
December is a winter month in Ennis, and is cooler than the annual average of 42.7°F. Daily temperatures swing about 18.7°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 8h 33m. For travel, December is cold.
Avg High
33.2°F
Avg Low
14.5°F
Precipitation
0.54 in
Snow
7.3 in
December records in Ennis
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 55.9°F (1995) | -14.1°F (1985) | 0.32 in (1921) |
| December 2 | 59.0°F (2021) | -11.9°F (1985) | 0.40 in (1919) |
| December 3 | 62.1°F (2021) | -5.1°F (1972) | 0.30 in (1958) |
| December 4 | 57.9°F (1939) | -17.0°F (1972) | 0.60 in (1994) |
| December 5 | 68.0°F (1939) | -24.0°F (1972) | 0.48 in (1919) |
| December 6 | 60.1°F (1939) | -20.9°F (1972) | 0.21 in (1986) |
| December 7 | 57.9°F (1939) | -23.1°F (1972) | 0.32 in (1919) |
| December 8 | 55.9°F (1940) | -26.0°F (1932) | 0.16 in (1926) |
| December 9 | 57.0°F (2025) | -32.1°F (1919) | 0.43 in (1997) |
| December 10 | 57.0°F (1933) | -32.1°F (1932) | 0.24 in (1926) |
| December 11 | 57.0°F (2025) | -33.0°F (1932) | 0.48 in (1919) |
| December 12 | 57.0°F (2025) | -34.1°F (1919) | 0.46 in (1983) |
| December 13 | 59.0°F (2014) | -34.1°F (1919) | 0.15 in (1999) |
| December 14 | 55.9°F (2025) | -23.1°F (1926) | 0.38 in (2015) |
| December 15 | 61.0°F (2025) | -20.9°F (2008) | 0.23 in (2021) |
| December 16 | 57.0°F (1962) | -24.0°F (2008) | 0.40 in (1927) |
| December 17 | 55.0°F (1976) | -31.0°F (2016) | 0.33 in (2002) |
| December 18 | 53.1°F (1979) | -20.9°F (2016) | 0.36 in (1977) |
| December 19 | 54.0°F (2003) | -34.1°F (1924) | 0.32 in (1923) |
| December 20 | 54.0°F (1941) | -24.0°F (2008) | 0.20 in (1929) |
| December 21 | 54.0°F (1969) | -27.9°F (1990) | 0.42 in (1996) |
| December 22 | 55.0°F (2024) | -31.0°F (2022) | 0.34 in (1973) |
| December 23 | 53.1°F (1964) | -31.0°F (2022) | 0.58 in (1955) |
| December 24 | 52.0°F (2025) | -29.9°F (1983) | 0.36 in (1955) |
| December 25 | 55.9°F (2025) | -26.0°F (1983) | 0.68 in (1996) |
| December 26 | 60.1°F (1980) | -17.0°F (1996) | 0.29 in (1971) |
| December 27 | 54.0°F (1980) | -15.0°F (1941) | 0.18 in (1934) |
| December 28 | 54.0°F (1945) | -20.0°F (1983) | 0.37 in (1928) |
| December 29 | 51.1°F (1980) | -32.1°F (1978) | 0.64 in (2005) |
| December 30 | 51.1°F (1980) | -27.9°F (1978) | 0.12 in (1973) |
| December 31 | 54.0°F (1980) | -35.0°F (1927) | 0.42 in (1940) |