December weather in Idaho Falls, ID
The average temperature in Idaho Falls in December is 24.0°F (17.2°F–30.8°F). Average precipitation: 1.14 inches.
December is a winter month in Idaho Falls, and is cooler than the annual average of 46.5°F. Daily temperatures swing about 13.6°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 8h 47m. For travel, December is cold.
Avg High
30.8°F
Avg Low
17.2°F
Precipitation
1.14 in
Daylight
8h 47m
December records in Idaho Falls
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1995) | -5.1°F (1967) | 0.41 in (2012) |
| December 2 | 55.0°F (2021) | 0.0°F (1971) | 0.33 in (1985) |
| December 3 | 54.0°F (1958) | -0.9°F (1984) | 0.65 in (1983) |
| December 4 | 57.0°F (1987) | -14.1°F (1992) | 0.70 in (1983) |
| December 5 | 48.9°F (1965) | -27.0°F (1972) | 0.45 in (1994) |
| December 6 | 55.0°F (1981) | -13.0°F (1972) | 0.54 in (1971) |
| December 7 | 57.0°F (1987) | -9.9°F (2005) | 1.10 in (1997) |
| December 8 | 51.1°F (1996) | -11.9°F (1971) | 0.20 in (1985) |
| December 9 | 57.9°F (2015) | -27.9°F (1972) | 0.41 in (1997) |
| December 10 | 55.0°F (1993) | -29.0°F (1972) | 0.27 in (1996) |
| December 11 | 57.0°F (2014) | -26.0°F (1972) | 0.39 in (1984) |
| December 12 | 57.0°F (2014) | -9.0°F (1972) | 0.22 in (1995) |
| December 13 | 51.1°F (2025) | -7.1°F (1967) | 0.35 in (2003) |
| December 14 | 53.1°F (2025) | -11.9°F (1984) | 0.41 in (1990) |
| December 15 | 48.9°F (1979) | -18.0°F (1972) | 0.24 in (1981) |
| December 16 | 53.1°F (2025) | -5.1°F (1978) | 0.60 in (2016) |
| December 17 | 53.1°F (2025) | -18.0°F (1964) | 0.47 in (2025) |
| December 18 | 54.0°F (1968) | -13.0°F (1984) | 0.45 in (1967) |
| December 19 | 48.9°F (1979) | -15.0°F (1984) | 0.18 in (1967) |
| December 20 | 46.9°F (1961) | -11.0°F (1998) | 0.33 in (1996) |
| December 21 | 51.1°F (2023) | -20.9°F (1983) | 0.50 in (1963) |
| December 22 | 54.0°F (1964) | -20.9°F (1983) | 0.41 in (2025) |
| December 23 | 52.0°F (1955) | -27.9°F (1983) | 0.56 in (1982) |
| December 24 | 54.0°F (2025) | -20.0°F (1983) | 0.70 in (1955) |
| December 25 | 54.0°F (2025) | -14.1°F (1952) | 0.43 in (2014) |
| December 26 | 48.9°F (1955) | -9.9°F (2001) | 0.80 in (1988) |
| December 27 | 45.0°F (1955) | -16.1°F (1954) | 0.30 in (2008) |
| December 28 | 48.0°F (1965) | -18.0°F (1954) | 0.92 in (1990) |
| December 29 | 51.1°F (2011) | -15.0°F (1978) | 0.35 in (1992) |
| December 30 | 54.0°F (2011) | -18.9°F (1978) | 0.59 in (1965) |
| December 31 | 54.0°F (1996) | -23.1°F (1978) | 0.47 in (2004) |