December weather in Harlem, MT
The average temperature in Harlem in December is 19.8°F (8.7°F–30.9°F). Average precipitation: 0.50 inches.
December is a winter month in Harlem, and is cooler than the annual average of 43.6°F. Daily temperatures swing about 22.2°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 8h 6m. For travel, December is cold.
Avg High
30.9°F
Avg Low
8.7°F
Precipitation
0.50 in
Daylight
8h 6m
December records in Harlem
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 69.1°F (1951) | -18.9°F (1966) | 0.28 in (1964) |
| December 2 | 68.0°F (1951) | -35.0°F (1985) | 0.80 in (1982) |
| December 3 | 61.0°F (1943) | -23.1°F (1972) | 0.20 in (1948) |
| December 4 | 64.0°F (1939) | -31.0°F (1972) | 0.10 in (1968) |
| December 5 | 64.9°F (1939) | -27.0°F (1972) | 0.88 in (1989) |
| December 6 | 59.0°F (1939) | -34.1°F (1936) | 0.25 in (1936) |
| December 7 | 59.0°F (1990) | -32.1°F (1956) | 0.35 in (1936) |
| December 8 | 60.1°F (1957) | -38.0°F (1972) | 0.50 in (1983) |
| December 9 | 57.9°F (1990) | -35.0°F (1972) | 0.30 in (2007) |
| December 10 | 59.0°F (1979) | -29.9°F (2000) | 0.54 in (1933) |
| December 11 | 61.0°F (2004) | -27.9°F (2000) | 0.20 in (1995) |
| December 12 | 55.0°F (1896) | -32.1°F (2000) | 0.08 in (1972) |
| December 13 | 63.0°F (1998) | -27.0°F (1985) | 0.43 in (2008) |
| December 14 | 57.9°F (1939) | -27.9°F (1963) | 0.21 in (1982) |
| December 15 | 63.0°F (1980) | -31.0°F (2008) | 0.36 in (1979) |
| December 16 | 66.0°F (1980) | -35.0°F (2008) | 0.25 in (1946) |
| December 17 | 64.9°F (1980) | -33.0°F (1964) | 0.16 in (1949) |
| December 18 | 57.9°F (1979) | -36.0°F (1983) | 0.17 in (1971) |
| December 19 | 57.9°F (1941) | -27.9°F (1980) | 0.42 in (1960) |
| December 20 | 66.0°F (1941) | -27.9°F (1949) | 0.46 in (1953) |
| December 21 | 57.9°F (1994) | -32.1°F (1989) | 0.31 in (1964) |
| December 22 | 57.0°F (1954) | -38.9°F (1989) | 0.50 in (1964) |
| December 23 | 55.0°F (1896) | -32.1°F (1983) | 0.51 in (1934) |
| December 24 | 59.0°F (1999) | -44.0°F (1983) | 0.20 in (1941) |
| December 25 | 54.0°F (1956) | -34.1°F (1983) | 0.20 in (1899) |
| December 26 | 54.0°F (1947) | -34.1°F (1996) | 0.54 in (1941) |
| December 27 | 60.1°F (1980) | -23.1°F (1988) | 0.65 in (2003) |
| December 28 | 61.0°F (1999) | -32.1°F (1968) | 0.51 in (1998) |
| December 29 | 60.1°F (1956) | -38.9°F (1968) | 0.32 in (2005) |
| December 30 | 51.1°F (1980) | -38.0°F (1924) | 1.00 in (2010) |
| December 31 | 57.0°F (1963) | -36.0°F (1924) | 0.48 in (1938) |