December weather in Helena, MT
The average temperature in Helena in December is 23.4°F (14.2°F–32.6°F). Average precipitation: 0.46 inches. Average snowfall is 7.7 inches.
December is a winter month in Helena, and is cooler than the annual average of 45.5°F. Daily temperatures swing about 18.4°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 8h 23m. For travel, December is cold.
Avg High
32.6°F
Avg Low
14.2°F
Precipitation
0.46 in
Snow
7.7 in
December records in Helena
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (2021) | -25.1°F (1985) | 0.45 in (1978) |
| December 2 | 64.0°F (2021) | -25.1°F (1985) | 0.24 in (1972) |
| December 3 | 62.1°F (1975) | -16.1°F (1972) | 0.34 in (1948) |
| December 4 | 61.0°F (1939) | -24.0°F (1972) | 0.32 in (1977) |
| December 5 | 64.0°F (2023) | -27.9°F (1972) | 0.35 in (1986) |
| December 6 | 61.0°F (2023) | -29.9°F (1972) | 0.51 in (1982) |
| December 7 | 57.9°F (2024) | -27.9°F (1972) | 0.30 in (1958) |
| December 8 | 62.1°F (1939) | -35.0°F (1972) | 0.33 in (2012) |
| December 9 | 59.0°F (1957) | -29.9°F (1972) | 0.20 in (1970) |
| December 10 | 64.9°F (1939) | -27.0°F (1972) | 0.10 in (1939) |
| December 11 | 59.0°F (1939) | -22.0°F (1961) | 0.33 in (1946) |
| December 12 | 62.1°F (2014) | -17.0°F (1961) | 0.27 in (2016) |
| December 13 | 57.0°F (1988) | -17.0°F (1963) | 0.29 in (1991) |
| December 14 | 57.0°F (1979) | -16.1°F (2008) | 0.25 in (2015) |
| December 15 | 57.9°F (2025) | -23.1°F (1979) | 0.45 in (2016) |
| December 16 | 60.1°F (1939) | -36.0°F (1964) | 0.32 in (1963) |
| December 17 | 57.9°F (1998) | -38.0°F (1964) | 0.23 in (2025) |
| December 18 | 55.9°F (1966) | -20.9°F (1964) | 0.27 in (1990) |
| December 19 | 59.0°F (1941) | -22.0°F (1990) | 0.27 in (2021) |
| December 20 | 54.0°F (2019) | -25.1°F (1990) | 0.28 in (2017) |
| December 21 | 55.9°F (2019) | -32.1°F (1990) | 0.19 in (1945) |
| December 22 | 55.0°F (1955) | -35.0°F (1990) | 0.25 in (1951) |
| December 23 | 53.1°F (2024) | -32.1°F (1983) | 0.40 in (1982) |
| December 24 | 52.0°F (1950) | -36.9°F (1983) | 0.42 in (1941) |
| December 25 | 53.1°F (1980) | -26.0°F (1983) | 0.43 in (1971) |
| December 26 | 61.0°F (1980) | -27.0°F (1996) | 0.37 in (1971) |
| December 27 | 64.0°F (1980) | -18.9°F (1941) | 0.23 in (1973) |
| December 28 | 54.0°F (1965) | -25.1°F (1968) | 0.23 in (2005) |
| December 29 | 53.1°F (1949) | -29.0°F (1990) | 0.64 in (2017) |
| December 30 | 52.0°F (1997) | -36.9°F (1968) | 0.22 in (1977) |
| December 31 | 52.0°F (1996) | -34.1°F (1968) | 0.14 in (1959) |