December weather in Forsyth, MT
The average temperature in Forsyth in December is 24.0°F (12.6°F–35.4°F). Average precipitation: 0.58 inches. Average snowfall is 6.9 inches.
December is a winter month in Forsyth, and is cooler than the annual average of 46.7°F. Daily temperatures swing about 22.8°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 26m. For travel, December is cold.
Avg High
35.4°F
Avg Low
12.6°F
Precipitation
0.58 in
Snow
6.9 in
December records in Forsyth
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (1995) | -17.0°F (1985) | 0.21 in (1984) |
| December 2 | 62.1°F (2021) | -33.0°F (1985) | 0.36 in (1982) |
| December 3 | 62.1°F (1989) | -9.0°F (1978) | 0.96 in (2013) |
| December 4 | 63.0°F (1989) | -11.0°F (2005) | 0.28 in (1978) |
| December 5 | 68.0°F (1979) | -20.9°F (2013) | 0.45 in (1989) |
| December 6 | 57.9°F (1987) | -27.9°F (2013) | 0.17 in (1977) |
| December 7 | 60.1°F (2015) | -33.0°F (2013) | 0.37 in (2023) |
| December 8 | 68.0°F (2020) | -27.9°F (2013) | 0.10 in (1983) |
| December 9 | 64.9°F (2015) | -34.1°F (1977) | 0.19 in (2000) |
| December 10 | 62.1°F (1979) | -18.9°F (2000) | 0.13 in (2025) |
| December 11 | 64.9°F (2004) | -16.1°F (2000) | 0.10 in (1981) |
| December 12 | 64.9°F (2017) | -18.9°F (1985) | 0.21 in (2025) |
| December 13 | 61.0°F (1998) | -26.0°F (1985) | 0.31 in (2008) |
| December 14 | 61.0°F (1997) | -23.1°F (2009) | 0.24 in (1996) |
| December 15 | 66.9°F (1980) | -25.1°F (2008) | 0.37 in (2024) |
| December 16 | 64.9°F (1980) | -26.0°F (1979) | 0.12 in (2016) |
| December 17 | 66.0°F (1998) | -27.0°F (2016) | 0.06 in (2021) |
| December 18 | 62.1°F (1988) | -32.1°F (1983) | 0.10 in (1990) |
| December 19 | 63.0°F (2004) | -18.0°F (1989) | 0.15 in (1993) |
| December 20 | 57.0°F (2020) | -20.9°F (1990) | 0.32 in (1989) |
| December 21 | 55.9°F (1991) | -36.9°F (1989) | 0.19 in (2021) |
| December 22 | 55.0°F (2005) | -44.0°F (1989) | 0.21 in (2008) |
| December 23 | 52.0°F (1986) | -27.0°F (2022) | 0.98 in (1984) |
| December 24 | 55.9°F (1999) | -38.9°F (1983) | 0.40 in (1982) |
| December 25 | 53.1°F (1993) | -34.1°F (1983) | 0.53 in (2016) |
| December 26 | 61.0°F (2025) | -25.1°F (1983) | 0.42 in (2003) |
| December 27 | 60.1°F (1980) | -16.1°F (2021) | 0.50 in (2003) |
| December 28 | 61.0°F (1999) | -17.0°F (1990) | 0.51 in (1996) |
| December 29 | 61.0°F (1999) | -27.0°F (1990) | 0.30 in (2017) |
| December 30 | 55.0°F (1980) | -32.1°F (1990) | 1.08 in (2004) |
| December 31 | 57.9°F (1997) | -27.0°F (1977) | 0.45 in (1975) |