January weather in Keystone, SD
The average temperature in Keystone in January is 27.8°F (18.8°F–36.8°F). Average precipitation: 0.48 inches. Average snowfall is 7.2 inches.
January is a winter month in Keystone, and is cooler than the annual average of 45.7°F. Daily temperatures swing about 18°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 4m. For travel, January is cold.
Avg High
36.8°F
Avg Low
18.8°F
Precipitation
0.48 in
Snow
7.2 in
January records in Keystone
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 60.1°F (1997) | -15.0°F (1979) | 0.10 in (1996) |
| January 2 | 55.0°F (1964) | -20.0°F (1968) | 0.40 in (2023) |
| January 3 | 54.0°F (2003) | -11.9°F (1976) | 0.17 in (1996) |
| January 4 | 57.9°F (2001) | -15.0°F (1973) | 0.28 in (2005) |
| January 5 | 63.0°F (2012) | -20.0°F (1979) | 0.09 in (1968) |
| January 6 | 54.0°F (2006) | -18.0°F (1968) | 0.56 in (1999) |
| January 7 | 64.0°F (2003) | -16.1°F (1976) | 0.38 in (1975) |
| January 8 | 63.0°F (2002) | -14.1°F (1976) | 0.29 in (2011) |
| January 9 | 59.0°F (1986) | -18.0°F (1980) | 0.11 in (1978) |
| January 10 | 57.0°F (1995) | -18.9°F (1982) | 0.17 in (1963) |
| January 11 | 59.0°F (1986) | -22.0°F (1963) | 0.40 in (2013) |
| January 12 | 64.9°F (1987) | -18.0°F (1963) | 0.31 in (1993) |
| January 13 | 61.0°F (1987) | -25.1°F (2024) | 0.12 in (1998) |
| January 14 | 62.1°F (1986) | -22.0°F (1972) | 0.15 in (2001) |
| January 15 | 63.0°F (1973) | -16.1°F (1972) | 0.30 in (1982) |
| January 16 | 63.0°F (1974) | -11.9°F (1982) | 0.19 in (2023) |
| January 17 | 59.0°F (1974) | -14.1°F (1970) | 0.37 in (1996) |
| January 18 | 62.1°F (2017) | -15.0°F (1984) | 0.09 in (1963) |
| January 19 | 59.0°F (1986) | -38.0°F (1963) | 0.13 in (2011) |
| January 20 | 62.1°F (2009) | -14.1°F (1966) | 0.30 in (2018) |
| January 21 | 60.1°F (2009) | -15.0°F (1966) | 0.29 in (1974) |
| January 22 | 60.1°F (1981) | -9.0°F (1963) | 0.41 in (1965) |
| January 23 | 68.0°F (1981) | -20.0°F (1963) | 0.50 in (1999) |
| January 24 | 64.0°F (2005) | -11.0°F (1969) | 0.31 in (2017) |
| January 25 | 60.1°F (1973) | -18.0°F (1972) | 0.16 in (1997) |
| January 26 | 61.0°F (2015) | -22.0°F (1972) | 0.26 in (1968) |
| January 27 | 70.0°F (2015) | -23.1°F (1972) | 0.20 in (1965) |
| January 28 | 66.0°F (2015) | -16.1°F (2004) | 0.18 in (2003) |
| January 29 | 55.9°F (2025) | -18.9°F (1996) | 0.21 in (2001) |
| January 30 | 57.9°F (1989) | -18.9°F (1996) | 0.60 in (1971) |
| January 31 | 63.0°F (1989) | -17.0°F (2011) | 0.32 in (2017) |