December weather in Ketchum, ID
The average temperature in Ketchum in December is 19.7°F (9.2°F–30.3°F). Average precipitation: 2.57 inches. Average snowfall is 32.0 inches.
December is a winter month in Ketchum, and is cooler than the annual average of 40.2°F. Daily temperatures swing about 21.1°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 8h 45m. For travel, December is cold.
Avg High
30.3°F
Avg Low
9.2°F
Precipitation
2.57 in
Snow
32.0 in
December records in Ketchum
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 59.0°F (2008) | -8.0°F (1991) | 0.76 in (2022) |
| December 2 | 51.1°F (2008) | -11.0°F (1984) | 1.07 in (2005) |
| December 3 | 55.9°F (2021) | -9.9°F (2022) | 1.45 in (1980) |
| December 4 | 48.0°F (1977) | -9.9°F (1984) | 0.94 in (1980) |
| December 5 | 51.1°F (2021) | -11.0°F (1992) | 0.85 in (1996) |
| December 6 | 48.0°F (1989) | -9.9°F (1983) | 0.86 in (2003) |
| December 7 | 46.0°F (1981) | -9.9°F (2016) | 1.10 in (2004) |
| December 8 | 45.0°F (2006) | -14.1°F (1978) | 0.54 in (2015) |
| December 9 | 48.0°F (1975) | -11.0°F (2013) | 0.92 in (2004) |
| December 10 | 48.0°F (1975) | -9.9°F (2009) | 0.85 in (1983) |
| December 11 | 48.0°F (2025) | -15.0°F (1985) | 0.88 in (1984) |
| December 12 | 52.0°F (2025) | -15.0°F (1985) | 1.09 in (1983) |
| December 13 | 52.0°F (2025) | -7.1°F (1985) | 1.88 in (1995) |
| December 14 | 53.1°F (2025) | -9.0°F (1984) | 1.10 in (2021) |
| December 15 | 52.0°F (2025) | -9.9°F (1990) | 1.39 in (1977) |
| December 16 | 46.0°F (2025) | -9.9°F (1978) | 0.45 in (2002) |
| December 17 | 50.0°F (2025) | -15.0°F (2016) | 1.03 in (2002) |
| December 18 | 48.0°F (1976) | -15.0°F (1984) | 0.63 in (1978) |
| December 19 | 43.0°F (1979) | -14.1°F (1984) | 0.66 in (2025) |
| December 20 | 45.0°F (2023) | -11.9°F (1983) | 1.14 in (1981) |
| December 21 | 48.9°F (2023) | -25.1°F (1990) | 1.17 in (1982) |
| December 22 | 46.9°F (2023) | -36.9°F (1990) | 1.10 in (1982) |
| December 23 | 43.0°F (1989) | -36.0°F (1990) | 1.34 in (1982) |
| December 24 | 45.0°F (2005) | -29.9°F (1990) | 0.57 in (1979) |
| December 25 | 44.1°F (1999) | -25.1°F (1990) | 0.96 in (1979) |
| December 26 | 46.0°F (1980) | -20.0°F (1990) | 0.60 in (2008) |
| December 27 | 50.0°F (1999) | -13.0°F (1988) | 0.62 in (2006) |
| December 28 | 46.9°F (1999) | -13.0°F (1982) | 1.01 in (1998) |
| December 29 | 44.1°F (2023) | -20.9°F (1978) | 1.05 in (2005) |
| December 30 | 48.9°F (2023) | -26.0°F (1990) | 0.60 in (1973) |
| December 31 | 46.0°F (1999) | -26.0°F (1978) | 1.10 in (2005) |