December weather in Thompson Falls, MT
The average temperature in Thompson Falls in December is 28.7°F (24.5°F–32.9°F). Average precipitation: 2.31 inches. Average snowfall is 7.5 inches.
December is a winter month in Thompson Falls, and is cooler than the annual average of 47.7°F. Daily temperatures swing about 8.4°F between overnight low and afternoon high. Expect about 17 days with precipitation. Daylight averages about 8h 14m. For travel, December is cold.
Avg High
32.9°F
Avg Low
24.5°F
Precipitation
2.31 in
Snow
7.5 in
December records in Thompson Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.0°F (2021) | -11.0°F (1985) | 0.70 in (1995) |
| December 2 | 60.1°F (2021) | 5.0°F (1985) | 1.21 in (1977) |
| December 3 | 55.9°F (1956) | 3.9°F (2022) | 1.25 in (2007) |
| December 4 | 55.0°F (1965) | -2.0°F (1972) | 1.07 in (1975) |
| December 5 | 57.9°F (1965) | -2.9°F (1972) | 0.48 in (1981) |
| December 6 | 46.9°F (1962) | 1.9°F (1972) | 0.74 in (1963) |
| December 7 | 48.9°F (1962) | -6.0°F (2013) | 0.79 in (1958) |
| December 8 | 48.9°F (1962) | -11.0°F (1972) | 0.58 in (2015) |
| December 9 | 54.0°F (1979) | -9.0°F (1972) | 0.79 in (2025) |
| December 10 | 53.1°F (1979) | -4.0°F (1961) | 0.84 in (1987) |
| December 11 | 50.0°F (2025) | -15.0°F (1961) | 0.55 in (1995) |
| December 12 | 50.0°F (1957) | -8.0°F (1985) | 0.57 in (1995) |
| December 13 | 48.0°F (1988) | 3.0°F (1985) | 0.44 in (2010) |
| December 14 | 48.0°F (2006) | 1.9°F (2008) | 0.49 in (1977) |
| December 15 | 50.0°F (1959) | -2.0°F (2008) | 0.69 in (2000) |
| December 16 | 54.0°F (2025) | -8.0°F (1964) | 0.49 in (1982) |
| December 17 | 45.0°F (1958) | -22.0°F (1964) | 0.83 in (1961) |
| December 18 | 48.9°F (2024) | -8.0°F (1964) | 0.65 in (1999) |
| December 19 | 52.0°F (2004) | -0.9°F (1990) | 0.55 in (2017) |
| December 20 | 52.0°F (2004) | -4.0°F (1998) | 0.37 in (1982) |
| December 21 | 50.0°F (2019) | -11.0°F (1983) | 0.84 in (1972) |
| December 22 | 50.0°F (1972) | -15.0°F (2022) | 1.41 in (1964) |
| December 23 | 46.9°F (1994) | -17.0°F (1983) | 0.79 in (1964) |
| December 24 | 46.9°F (1992) | -9.9°F (1983) | 0.55 in (2014) |
| December 25 | 48.0°F (1972) | -2.0°F (1983) | 0.65 in (1980) |
| December 26 | 48.9°F (1980) | 1.0°F (1988) | 0.67 in (1998) |
| December 27 | 51.1°F (1980) | 3.9°F (1983) | 0.70 in (1996) |
| December 28 | 48.0°F (1980) | -9.0°F (1983) | 0.95 in (1998) |
| December 29 | 48.9°F (2004) | -29.9°F (1990) | 0.94 in (1996) |
| December 30 | 50.0°F (1962) | -25.1°F (1968) | 0.55 in (2017) |
| December 31 | 46.9°F (1963) | -22.0°F (1978) | 0.67 in (1996) |