December weather in Interior, SD
The average temperature in Interior in December is 27.8°F (16.6°F–39.0°F). Average precipitation: 0.54 inches. Average snowfall is 7.7 inches.
December is a winter month in Interior, and is cooler than the annual average of 50.4°F. Daily temperatures swing about 22.4°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 8h 45m. For travel, December is cold.
Avg High
39.0°F
Avg Low
16.6°F
Precipitation
0.54 in
Snow
7.7 in
December records in Interior
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 71.1°F (1998) | -8.0°F (1985) | 0.31 in (2015) |
| December 2 | 71.1°F (2021) | -20.0°F (1985) | 0.18 in (1996) |
| December 3 | 66.0°F (1956) | -6.0°F (2022) | 0.51 in (1955) |
| December 4 | 66.0°F (1975) | -4.0°F (2005) | 0.36 in (2013) |
| December 5 | 64.0°F (1963) | -13.0°F (2005) | 0.10 in (1983) |
| December 6 | 64.0°F (2023) | -20.9°F (1972) | 0.20 in (1980) |
| December 7 | 66.0°F (2023) | -14.1°F (1977) | 0.20 in (1971) |
| December 8 | 60.1°F (1990) | -18.9°F (1972) | 0.20 in (1971) |
| December 9 | 72.0°F (1957) | -16.1°F (1977) | 0.15 in (2012) |
| December 10 | 64.0°F (1984) | -8.0°F (1972) | 0.47 in (2021) |
| December 11 | 66.9°F (1968) | -18.9°F (2013) | 0.57 in (1965) |
| December 12 | 72.0°F (2014) | -24.0°F (2000) | 0.23 in (1956) |
| December 13 | 72.0°F (2014) | -20.0°F (1985) | 0.60 in (2022) |
| December 14 | 69.1°F (1998) | -18.0°F (1963) | 0.32 in (1996) |
| December 15 | 64.0°F (2002) | -27.0°F (1989) | 0.24 in (2014) |
| December 16 | 64.0°F (1962) | -17.0°F (1964) | 0.42 in (2015) |
| December 17 | 64.9°F (1998) | -20.9°F (1964) | 0.43 in (2016) |
| December 18 | 66.9°F (1979) | -23.1°F (2016) | 0.22 in (1985) |
| December 19 | 60.1°F (2025) | -18.9°F (1989) | 0.21 in (2013) |
| December 20 | 61.0°F (2003) | -17.0°F (1990) | 0.17 in (2010) |
| December 21 | 62.1°F (1957) | -27.0°F (1983) | 0.15 in (1967) |
| December 22 | 72.0°F (2025) | -31.0°F (1989) | 0.20 in (1966) |
| December 23 | 61.0°F (1994) | -31.0°F (1983) | 0.27 in (1980) |
| December 24 | 60.1°F (1955) | -23.1°F (1983) | 0.18 in (1980) |
| December 25 | 61.0°F (1979) | -23.1°F (1983) | 0.30 in (1964) |
| December 26 | 66.0°F (2003) | -23.1°F (1996) | 0.93 in (2023) |
| December 27 | 59.0°F (1957) | -13.0°F (2017) | 0.38 in (1987) |
| December 28 | 61.0°F (1999) | -8.0°F (1988) | 0.44 in (2019) |
| December 29 | 62.1°F (1965) | -20.9°F (1990) | 0.25 in (2019) |
| December 30 | 61.0°F (1965) | -27.9°F (1990) | 0.33 in (2010) |
| December 31 | 60.1°F (1963) | -23.1°F (1967) | 0.45 in (2010) |