December weather in St. Charles, ID
The average temperature in St. Charles in December is 20.4°F (10.4°F–30.4°F). Average precipitation: 0.75 inches. Average snowfall is 7.2 inches.
December is a winter month in St. Charles, and is cooler than the annual average of 41°F. Daily temperatures swing about 20°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 56m. For travel, December is cold.
Avg High
30.4°F
Avg Low
10.4°F
Precipitation
0.75 in
Snow
7.2 in
December records in St. Charles
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.0°F (1995) | -8.0°F (1991) | 0.20 in (1955) |
| December 2 | 57.9°F (1995) | -7.1°F (1945) | 0.53 in (1977) |
| December 3 | 52.0°F (1926) | -0.9°F (2022) | 0.38 in (2012) |
| December 4 | 52.0°F (1998) | -9.9°F (1992) | 0.55 in (1954) |
| December 5 | 54.0°F (1946) | -16.1°F (1972) | 0.25 in (1956) |
| December 6 | 55.0°F (1981) | -7.1°F (1972) | 0.50 in (2025) |
| December 7 | 52.0°F (1939) | -18.0°F (1978) | 0.55 in (1982) |
| December 8 | 52.0°F (1939) | -22.0°F (1978) | 0.29 in (2007) |
| December 9 | 59.0°F (1939) | -20.0°F (1919) | 0.22 in (1929) |
| December 10 | 60.1°F (1939) | -25.1°F (1972) | 0.24 in (2000) |
| December 11 | 57.0°F (1939) | -26.0°F (1972) | 0.27 in (2015) |
| December 12 | 54.0°F (2025) | -27.9°F (1932) | 0.58 in (1937) |
| December 13 | 52.0°F (2025) | -24.0°F (1919) | 0.64 in (1933) |
| December 14 | 50.0°F (1946) | -20.0°F (1919) | 0.37 in (1933) |
| December 15 | 51.1°F (1946) | -15.0°F (1927) | 0.26 in (2021) |
| December 16 | 55.9°F (1979) | -11.9°F (2005) | 0.39 in (2016) |
| December 17 | 52.0°F (1939) | -18.0°F (1964) | 0.18 in (2016) |
| December 18 | 48.9°F (2025) | -16.1°F (1964) | 0.30 in (1978) |
| December 19 | 48.9°F (2025) | -22.0°F (1924) | 0.50 in (1921) |
| December 20 | 48.0°F (1961) | -18.0°F (1924) | 0.90 in (1921) |
| December 21 | 55.0°F (1969) | -16.1°F (1990) | 0.80 in (1921) |
| December 22 | 51.1°F (2025) | -29.0°F (1990) | 0.49 in (1964) |
| December 23 | 53.1°F (1964) | -27.9°F (1990) | 1.29 in (1964) |
| December 24 | 48.9°F (1955) | -29.0°F (1924) | 0.80 in (1955) |
| December 25 | 48.9°F (2025) | -27.0°F (1990) | 0.44 in (1959) |
| December 26 | 51.1°F (1933) | -17.0°F (1924) | 0.46 in (2003) |
| December 27 | 46.9°F (1933) | -15.0°F (1988) | 0.15 in (1955) |
| December 28 | 46.0°F (1980) | -13.0°F (1954) | 0.38 in (2022) |
| December 29 | 48.9°F (1945) | -26.0°F (1978) | 0.34 in (1965) |
| December 30 | 53.1°F (2017) | -33.0°F (1978) | 0.35 in (2010) |
| December 31 | 50.0°F (2011) | -27.9°F (1978) | 0.49 in (2005) |