December weather in Edgemont, SD
The average temperature in Edgemont in December is 20.1°F (5.4°F–34.8°F). Average precipitation: 0.44 inches. Average snowfall is 6.1 inches.
December is a winter month in Edgemont, and is cooler than the annual average of 44.4°F. Daily temperatures swing about 29.4°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 8h 48m. For travel, December is cold.
Avg High
34.8°F
Avg Low
5.4°F
Precipitation
0.44 in
Snow
6.1 in
December records in Edgemont
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.0°F (1995) | -16.1°F (1985) | 0.16 in (1950) |
| December 2 | 70.0°F (1995) | -29.0°F (1985) | 0.40 in (2018) |
| December 3 | 66.0°F (1998) | -13.0°F (2022) | 0.03 in (1991) |
| December 4 | 59.0°F (1994) | -13.0°F (2022) | 0.19 in (1983) |
| December 5 | 62.1°F (1987) | -20.0°F (1992) | 0.09 in (1983) |
| December 6 | 62.1°F (1987) | -17.0°F (1983) | 0.13 in (1980) |
| December 7 | 62.1°F (2003) | -16.1°F (2013) | 0.17 in (1982) |
| December 8 | 61.0°F (2023) | -9.9°F (2016) | 0.41 in (1994) |
| December 9 | 57.9°F (2020) | -16.1°F (2009) | 0.11 in (2009) |
| December 10 | 59.0°F (2015) | -18.9°F (2009) | 0.24 in (2000) |
| December 11 | 63.0°F (1981) | -23.1°F (2000) | 0.12 in (1989) |
| December 12 | 64.9°F (2025) | -18.9°F (2000) | 0.06 in (1984) |
| December 13 | 63.0°F (2014) | -16.1°F (1985) | 0.71 in (1992) |
| December 14 | 62.1°F (1988) | -11.9°F (1992) | 0.29 in (1994) |
| December 15 | 63.0°F (2002) | -23.1°F (1989) | 0.35 in (2019) |
| December 16 | 55.9°F (2025) | -18.9°F (2008) | 0.42 in (2015) |
| December 17 | 57.0°F (2025) | -17.0°F (1984) | 0.74 in (2016) |
| December 18 | 63.0°F (2025) | -36.0°F (2016) | 0.08 in (1985) |
| December 19 | 60.1°F (1979) | -31.0°F (2016) | 0.12 in (1998) |
| December 20 | 60.1°F (2025) | -20.0°F (2016) | 0.27 in (2013) |
| December 21 | 55.0°F (2017) | -31.0°F (1983) | 0.40 in (2017) |
| December 22 | 55.9°F (2023) | -40.0°F (1989) | 0.19 in (2011) |
| December 23 | 70.0°F (2025) | -38.0°F (1983) | 0.16 in (1996) |
| December 24 | 66.0°F (2025) | -31.0°F (1983) | 0.26 in (1948) |
| December 25 | 69.1°F (2025) | -31.0°F (1983) | 0.13 in (2007) |
| December 26 | 60.1°F (2025) | -16.1°F (1996) | 0.19 in (2015) |
| December 27 | 59.0°F (2025) | -18.0°F (2017) | 0.12 in (1983) |
| December 28 | 59.0°F (1999) | -14.1°F (2015) | 0.22 in (1987) |
| December 29 | 57.9°F (2002) | -23.1°F (1990) | 0.34 in (2006) |
| December 30 | 50.0°F (2008) | -35.0°F (1990) | 0.03 in (1989) |
| December 31 | 53.1°F (2004) | -17.0°F (2014) | 0.31 in (2018) |