December weather in Custer, SD
The average temperature in Custer in December is 26.5°F (16.6°F–36.5°F). Average precipitation: 0.36 inches. Average snowfall is 5.4 inches.
December is a winter month in Custer, and is cooler than the annual average of 44.9°F. Daily temperatures swing about 19.9°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 8h 45m. For travel, December is cold.
Avg High
36.5°F
Avg Low
16.6°F
Precipitation
0.36 in
Snow
5.4 in
December records in Custer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1969) | -16.1°F (1954) | 0.37 in (1980) |
| December 2 | 64.0°F (1969) | -11.9°F (1954) | 0.36 in (2018) |
| December 3 | 63.0°F (1959) | -7.1°F (1978) | 0.32 in (1955) |
| December 4 | 63.0°F (1987) | -9.0°F (1972) | 0.55 in (1983) |
| December 5 | 60.1°F (1963) | -25.1°F (1972) | 0.41 in (1977) |
| December 6 | 60.1°F (1963) | -27.0°F (1972) | 0.29 in (1979) |
| December 7 | 59.0°F (2023) | -16.1°F (2005) | 0.40 in (1966) |
| December 8 | 61.0°F (2020) | -26.0°F (1972) | 0.28 in (1914) |
| December 9 | 64.0°F (1990) | -25.1°F (1977) | 0.33 in (1989) |
| December 10 | 62.1°F (1990) | -18.0°F (1961) | 0.36 in (2021) |
| December 11 | 61.0°F (1981) | -20.9°F (1961) | 0.26 in (1940) |
| December 12 | 63.0°F (2014) | -20.0°F (1961) | 0.39 in (1937) |
| December 13 | 55.9°F (1962) | -18.9°F (1961) | 0.37 in (1996) |
| December 14 | 62.1°F (1997) | -17.0°F (1989) | 0.59 in (1975) |
| December 15 | 62.1°F (1952) | -25.1°F (1945) | 0.19 in (1993) |
| December 16 | 63.0°F (1962) | -17.0°F (1979) | 0.50 in (1981) |
| December 17 | 62.1°F (1962) | -36.9°F (1964) | 0.14 in (1963) |
| December 18 | 66.0°F (1976) | -34.1°F (1964) | 0.62 in (1973) |
| December 19 | 68.0°F (1979) | -22.0°F (1990) | 0.40 in (2013) |
| December 20 | 60.1°F (1954) | -25.1°F (1951) | 0.40 in (1911) |
| December 21 | 57.9°F (2003) | -29.9°F (1990) | 0.50 in (1911) |
| December 22 | 62.1°F (1954) | -31.0°F (2022) | 0.18 in (1966) |
| December 23 | 55.9°F (1994) | -34.1°F (1983) | 0.37 in (1984) |
| December 24 | 57.0°F (1999) | -26.0°F (1944) | 0.90 in (1948) |
| December 25 | 60.1°F (1960) | -22.0°F (1944) | 0.52 in (1964) |
| December 26 | 55.0°F (1963) | -22.0°F (1962) | 0.26 in (1969) |
| December 27 | 60.1°F (1947) | -11.9°F (1964) | 0.35 in (1915) |
| December 28 | 62.1°F (1980) | -29.0°F (1990) | 0.21 in (1921) |
| December 29 | 55.9°F (1956) | -24.0°F (1946) | 0.29 in (2017) |
| December 30 | 55.9°F (1956) | -23.1°F (1978) | 0.18 in (1994) |
| December 31 | 61.0°F (1962) | -27.9°F (1978) | 0.47 in (1931) |