December weather in Harlowton, MT
The average temperature in Harlowton in December is 25.0°F (14.7°F–35.4°F). Average precipitation: 0.41 inches. Average snowfall is 3.7 inches.
December is a winter month in Harlowton, and is cooler than the annual average of 43.8°F. Daily temperatures swing about 20.7°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 8h 24m. For travel, December is cold.
Avg High
35.4°F
Avg Low
14.7°F
Precipitation
0.41 in
Snow
3.7 in
December records in Harlowton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.9°F (2021) | -18.9°F (1985) | 0.45 in (1966) |
| December 2 | 66.0°F (2021) | -27.0°F (1985) | 0.37 in (1977) |
| December 3 | 64.0°F (1987) | -11.9°F (1978) | 0.57 in (1950) |
| December 4 | 63.0°F (1979) | -20.0°F (1950) | 0.76 in (1998) |
| December 5 | 59.0°F (2023) | -24.0°F (1972) | 0.22 in (1978) |
| December 6 | 59.0°F (2023) | -27.0°F (1956) | 0.35 in (1982) |
| December 7 | 57.9°F (2024) | -26.0°F (1956) | 0.31 in (2003) |
| December 8 | 57.0°F (1990) | -31.0°F (1972) | 0.23 in (1983) |
| December 9 | 62.1°F (1957) | -20.9°F (1977) | 0.28 in (1970) |
| December 10 | 62.1°F (2015) | -17.0°F (1961) | 0.14 in (1949) |
| December 11 | 60.1°F (2004) | -24.0°F (2000) | 0.51 in (2025) |
| December 12 | 54.0°F (1962) | -23.1°F (2000) | 0.27 in (1958) |
| December 13 | 59.0°F (1960) | -14.1°F (1972) | 0.10 in (1975) |
| December 14 | 61.0°F (1952) | -18.9°F (2009) | 0.47 in (1951) |
| December 15 | 64.9°F (1952) | -24.0°F (2008) | 0.21 in (1975) |
| December 16 | 62.1°F (1962) | -31.0°F (1964) | 0.36 in (1963) |
| December 17 | 60.1°F (1976) | -38.9°F (1964) | 0.21 in (1955) |
| December 18 | 59.0°F (2013) | -25.1°F (1983) | 0.14 in (1977) |
| December 19 | 60.1°F (2004) | -23.1°F (1990) | 0.30 in (1997) |
| December 20 | 59.0°F (2023) | -24.0°F (1990) | 0.23 in (1964) |
| December 21 | 57.0°F (2024) | -29.9°F (1989) | 0.36 in (1964) |
| December 22 | 57.9°F (1954) | -34.1°F (1990) | 0.13 in (1973) |
| December 23 | 54.0°F (1950) | -23.1°F (1996) | 0.90 in (1955) |
| December 24 | 63.0°F (1999) | -38.0°F (1983) | 0.24 in (2023) |
| December 25 | 59.0°F (2025) | -25.1°F (1983) | 0.60 in (1996) |
| December 26 | 59.0°F (1980) | -32.1°F (1996) | 0.45 in (1971) |
| December 27 | 64.0°F (1980) | -17.0°F (2021) | 0.37 in (1996) |
| December 28 | 55.9°F (2013) | -23.1°F (1968) | 0.23 in (1978) |
| December 29 | 57.9°F (1956) | -31.0°F (1968) | 0.43 in (2003) |
| December 30 | 55.9°F (1962) | -38.0°F (1968) | 0.27 in (1977) |
| December 31 | 59.0°F (2025) | -24.0°F (1992) | 0.15 in (1951) |