December weather in Shelley, ID
The average temperature in Shelley in December is 21.9°F (13.4°F–30.3°F). Average precipitation: 0.78 inches.
December is a winter month in Shelley, and is cooler than the annual average of 44.2°F. Daily temperatures swing about 16.9°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 8h 48m. For travel, December is cold.
Avg High
30.3°F
Avg Low
13.4°F
Precipitation
0.78 in
Daylight
8h 48m
December records in Shelley
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 54.0°F (2012) | -2.0°F (1967) | 0.20 in (1955) |
| December 2 | 54.0°F (2021) | -0.8°F (2015) | 0.31 in (1961) |
| December 3 | 55.9°F (1987) | -15.0°F (1992) | 0.59 in (1972) |
| December 4 | 54.0°F (2021) | -18.9°F (1992) | 0.35 in (1983) |
| December 5 | 51.1°F (2021) | -31.0°F (1972) | 0.28 in (1966) |
| December 6 | 55.0°F (1987) | -16.1°F (1972) | 0.28 in (1953) |
| December 7 | 48.0°F (1981) | -14.1°F (1972) | 0.25 in (1950) |
| December 8 | 53.1°F (1998) | -20.0°F (1972) | 0.12 in (2019) |
| December 9 | 57.0°F (2015) | -29.0°F (1972) | 0.44 in (1970) |
| December 10 | 53.1°F (2025) | -29.9°F (1972) | 0.22 in (2016) |
| December 11 | 57.9°F (2014) | -26.0°F (1972) | 0.35 in (1958) |
| December 12 | 57.9°F (2014) | -14.1°F (1967) | 0.16 in (1971) |
| December 13 | 50.0°F (2025) | -14.1°F (1967) | 0.32 in (1974) |
| December 14 | 51.1°F (2002) | -13.0°F (1951) | 0.25 in (2024) |
| December 15 | 50.0°F (2025) | -14.1°F (1972) | 0.20 in (1977) |
| December 16 | 54.0°F (2025) | -14.1°F (1964) | 0.62 in (2016) |
| December 17 | 53.1°F (2025) | -20.9°F (1964) | 0.51 in (2025) |
| December 18 | 46.0°F (1962) | -13.9°F (2016) | 0.41 in (1967) |
| December 19 | 48.0°F (2023) | -12.8°F (2016) | 0.40 in (2010) |
| December 20 | 44.1°F (1958) | -18.9°F (1998) | 0.40 in (1952) |
| December 21 | 50.0°F (1969) | -24.0°F (1983) | 0.43 in (2025) |
| December 22 | 51.1°F (1955) | -25.1°F (1983) | 0.38 in (1979) |
| December 23 | 51.1°F (1955) | -29.9°F (1983) | 0.72 in (1982) |
| December 24 | 52.0°F (2025) | -18.0°F (1990) | 0.46 in (2025) |
| December 25 | 52.0°F (2025) | -15.0°F (1990) | 0.42 in (1959) |
| December 26 | 53.1°F (1980) | -15.0°F (2001) | 0.27 in (1955) |
| December 27 | 53.1°F (1980) | -17.0°F (1954) | 0.35 in (2022) |
| December 28 | 46.0°F (2002) | -13.0°F (1954) | 0.41 in (1957) |
| December 29 | 48.9°F (2011) | -18.0°F (1978) | 0.53 in (1992) |
| December 30 | 52.0°F (2011) | -24.0°F (1978) | 0.51 in (1965) |
| December 31 | 48.0°F (1980) | -29.0°F (1978) | 0.33 in (2004) |