December weather in Great Falls, MT
The average temperature in Great Falls in December is 28.3°F (19.8°F–36.7°F). Average precipitation: 0.56 inches.
December is a winter month in Great Falls, and is cooler than the annual average of 47°F. Daily temperatures swing about 16.9°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 8h 15m. For travel, December is cold.
Avg High
36.7°F
Avg Low
19.8°F
Precipitation
0.56 in
Daylight
8h 15m
December records in Great Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1907) | -14.1°F (2014) | 0.45 in (1921) |
| December 2 | 59.0°F (1926) | -27.0°F (1919) | 0.45 in (1921) |
| December 3 | 61.0°F (1915) | -15.0°F (1919) | 0.29 in (2010) |
| December 4 | 61.0°F (1915) | -15.0°F (1928) | 0.20 in (1910) |
| December 5 | 55.9°F (1925) | -18.9°F (2013) | 0.27 in (2009) |
| December 6 | 60.1°F (1918) | -18.9°F (1956) | 0.38 in (1922) |
| December 7 | 60.1°F (1900) | -23.1°F (2013) | 0.33 in (1919) |
| December 8 | 61.0°F (2024) | -33.0°F (1919) | 0.48 in (1907) |
| December 9 | 59.0°F (1925) | -38.0°F (1919) | 0.38 in (1892) |
| December 10 | 59.0°F (1913) | -20.0°F (1919) | 0.34 in (1933) |
| December 11 | 59.0°F (2014) | -26.0°F (1932) | 0.36 in (1903) |
| December 12 | 64.0°F (2014) | -32.1°F (1922) | 0.50 in (1932) |
| December 13 | 59.0°F (1921) | -29.0°F (1922) | 0.51 in (1906) |
| December 14 | 60.1°F (1924) | -25.1°F (1922) | 0.56 in (2015) |
| December 15 | 63.0°F (2025) | -24.0°F (1924) | 0.55 in (1921) |
| December 16 | 64.0°F (2025) | -32.1°F (1924) | 0.61 in (1929) |
| December 17 | 57.0°F (1923) | -27.0°F (1924) | 0.11 in (1921) |
| December 18 | 57.9°F (1917) | -27.0°F (1924) | 0.12 in (1892) |
| December 19 | 57.9°F (1954) | -16.1°F (1929) | 0.34 in (1925) |
| December 20 | 57.0°F (1900) | -22.0°F (1921) | 0.33 in (2017) |
| December 21 | 64.9°F (1933) | -20.9°F (1916) | 0.14 in (1892) |
| December 22 | 59.0°F (1954) | -27.0°F (1892) | 0.34 in (2017) |
| December 23 | 55.9°F (1936) | -14.1°F (1916) | 0.45 in (1892) |
| December 24 | 57.9°F (1919) | -17.0°F (1916) | 0.35 in (2014) |
| December 25 | 60.1°F (2005) | -18.9°F (1916) | 0.21 in (2014) |
| December 26 | 57.0°F (1956) | -36.0°F (1916) | 0.25 in (2008) |
| December 27 | 61.0°F (1956) | -36.9°F (1916) | 0.24 in (1933) |
| December 28 | 63.0°F (1956) | -26.0°F (1916) | 0.55 in (2006) |
| December 29 | 61.0°F (1956) | -25.1°F (1916) | 0.62 in (2010) |
| December 30 | 63.0°F (1917) | -25.1°F (1923) | 0.70 in (1917) |
| December 31 | 62.1°F (1956) | -33.0°F (1923) | 0.41 in (1899) |