December weather in Shelby, MT
The average temperature in Shelby in December is 21.1°F (9.1°F–33.1°F). Average precipitation: 0.46 inches. Average snowfall is 5.5 inches.
December is a winter month in Shelby, and is cooler than the annual average of 42.2°F. Daily temperatures swing about 24°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 7m. For travel, December is cold.
Avg High
33.1°F
Avg Low
9.1°F
Precipitation
0.46 in
Snow
5.5 in
December records in Shelby
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (2021) | -18.0°F (2014) | 0.11 in (2022) |
| December 2 | 64.0°F (2021) | -27.0°F (1950) | 0.18 in (2002) |
| December 3 | 54.0°F (2021) | -15.0°F (1955) | 0.24 in (2013) |
| December 4 | 51.1°F (1957) | -16.1°F (2010) | 0.18 in (2021) |
| December 5 | 55.0°F (2023) | -25.1°F (1950) | 0.35 in (2009) |
| December 6 | 62.1°F (2023) | -32.1°F (1956) | 0.38 in (2009) |
| December 7 | 55.9°F (2020) | -33.0°F (2013) | 0.21 in (2022) |
| December 8 | 59.0°F (2024) | -32.1°F (2009) | 0.21 in (2000) |
| December 9 | 60.1°F (2020) | -31.0°F (2009) | 0.06 in (1953) |
| December 10 | 57.0°F (2017) | -24.0°F (2000) | 0.45 in (1995) |
| December 11 | 59.0°F (2017) | -24.0°F (2000) | 0.14 in (2016) |
| December 12 | 53.1°F (1998) | -26.0°F (2000) | 0.34 in (2022) |
| December 13 | 61.0°F (1952) | -18.0°F (2016) | 0.20 in (1995) |
| December 14 | 59.0°F (1952) | -24.0°F (2008) | 0.18 in (2008) |
| December 15 | 55.9°F (2025) | -27.0°F (2009) | 0.30 in (1951) |
| December 16 | 55.0°F (2025) | -24.0°F (2008) | 0.16 in (2016) |
| December 17 | 55.9°F (2023) | -29.0°F (2016) | 0.07 in (1992) |
| December 18 | 62.1°F (1954) | -34.1°F (1955) | 0.30 in (1951) |
| December 19 | 64.0°F (1954) | -24.0°F (1951) | 0.18 in (2013) |
| December 20 | 59.0°F (1956) | -29.0°F (1951) | 0.27 in (2017) |
| December 21 | 60.1°F (1954) | -27.9°F (2008) | 0.23 in (2022) |
| December 22 | 57.0°F (2019) | -26.0°F (2022) | 0.29 in (2000) |
| December 23 | 57.9°F (2023) | -27.0°F (2022) | 0.12 in (2008) |
| December 24 | 61.0°F (1999) | -27.0°F (1951) | 0.11 in (2014) |
| December 25 | 55.9°F (2005) | -23.1°F (2012) | 0.33 in (2016) |
| December 26 | 53.1°F (2005) | -36.0°F (1996) | 0.12 in (1998) |
| December 27 | 64.9°F (1999) | -22.0°F (2017) | 0.08 in (1951) |
| December 28 | 64.0°F (1956) | -27.0°F (1996) | 0.21 in (2003) |
| December 29 | 64.9°F (1956) | -33.0°F (1996) | 0.56 in (1996) |
| December 30 | 57.9°F (1956) | -34.1°F (1951) | 0.38 in (2017) |
| December 31 | 55.0°F (1997) | -29.0°F (1992) | 0.15 in (1953) |