December weather in Swan Valley, ID
The average temperature in Swan Valley in December is 22.0°F (12.4°F–31.6°F). Average precipitation: 1.44 inches.
December is a winter month in Swan Valley, and is cooler than the annual average of 42.6°F. Daily temperatures swing about 19.2°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 8h 47m. For travel, December is cold.
Avg High
31.6°F
Avg Low
12.4°F
Precipitation
1.44 in
Daylight
8h 47m
December records in Swan Valley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.9°F (1995) | -14.1°F (1991) | 0.70 in (1964) |
| December 2 | 54.0°F (1995) | -5.1°F (1971) | 0.35 in (2013) |
| December 3 | 57.9°F (2021) | -8.0°F (1978) | 0.46 in (1961) |
| December 4 | 54.0°F (2021) | -20.9°F (1992) | 1.00 in (1994) |
| December 5 | 57.9°F (1979) | -38.0°F (1972) | 0.72 in (2025) |
| December 6 | 54.0°F (1981) | -22.0°F (1972) | 0.60 in (2001) |
| December 7 | 53.1°F (2008) | -20.0°F (1978) | 0.31 in (1974) |
| December 8 | 48.0°F (2019) | -27.0°F (1978) | 0.70 in (1999) |
| December 9 | 50.0°F (1975) | -27.9°F (1972) | 0.29 in (1970) |
| December 10 | 53.1°F (2015) | -29.9°F (1972) | 0.31 in (2016) |
| December 11 | 50.0°F (2014) | -23.1°F (1972) | 0.40 in (1971) |
| December 12 | 54.0°F (2025) | -15.0°F (1967) | 0.27 in (1999) |
| December 13 | 55.9°F (2014) | -25.1°F (1967) | 0.47 in (2009) |
| December 14 | 53.1°F (2025) | -22.0°F (1967) | 0.60 in (2006) |
| December 15 | 48.9°F (2025) | -16.1°F (1972) | 0.54 in (1981) |
| December 16 | 48.9°F (2025) | -20.0°F (1971) | 0.30 in (2010) |
| December 17 | 54.0°F (2025) | -24.0°F (1964) | 0.60 in (1999) |
| December 18 | 50.0°F (1962) | -18.9°F (1989) | 0.23 in (1972) |
| December 19 | 48.9°F (1962) | -9.0°F (1984) | 0.28 in (1972) |
| December 20 | 48.9°F (2023) | -25.1°F (1990) | 0.41 in (1974) |
| December 21 | 48.9°F (1969) | -27.0°F (1990) | 0.85 in (1961) |
| December 22 | 50.0°F (1964) | -43.1°F (1990) | 0.35 in (1992) |
| December 23 | 48.9°F (2025) | -40.0°F (1990) | 1.20 in (1964) |
| December 24 | 54.0°F (2025) | -27.9°F (1990) | 0.52 in (2013) |
| December 25 | 55.0°F (2025) | -20.0°F (1962) | 0.80 in (1996) |
| December 26 | 55.9°F (2025) | -15.0°F (1974) | 0.48 in (2005) |
| December 27 | 53.1°F (1980) | -15.0°F (1966) | 0.66 in (2020) |
| December 28 | 46.0°F (1980) | -24.0°F (1983) | 0.34 in (1996) |
| December 29 | 43.0°F (2011) | -18.0°F (1969) | 0.73 in (2011) |
| December 30 | 46.0°F (1980) | -31.0°F (1990) | 0.27 in (1965) |
| December 31 | 45.0°F (2023) | -29.0°F (1978) | 0.85 in (1998) |