December weather in Wheaton, MO
The average temperature in Wheaton in December is 37.5°F (27.8°F–47.2°F). Average precipitation: 2.85 inches. Average snowfall is 1.1 inches.
December is a winter month in Wheaton, and is cooler than the annual average of 56.8°F. Daily temperatures swing about 19.4°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 30m. For travel, December is cool.
Avg High
47.2°F
Avg Low
27.8°F
Precipitation
2.85 in
Snow
1.1 in
December records in Wheaton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 73.0°F (1982) | 10.0°F (1985) | 1.39 in (2006) |
| December 2 | 69.1°F (1982) | 6.1°F (1985) | 2.17 in (1982) |
| December 3 | 73.9°F (2021) | 10.9°F (1989) | 1.41 in (1973) |
| December 4 | 72.0°F (2012) | 12.0°F (2006) | 1.63 in (2012) |
| December 5 | 71.1°F (1989) | 12.0°F (2002) | 2.62 in (1999) |
| December 6 | 73.9°F (1998) | 3.9°F (1972) | 0.83 in (1974) |
| December 7 | 64.0°F (1980) | -0.9°F (2013) | 0.96 in (2004) |
| December 8 | 75.0°F (1991) | 7.0°F (2013) | 1.47 in (1980) |
| December 9 | 66.0°F (1993) | 1.0°F (1995) | 1.36 in (1992) |
| December 10 | 69.1°F (2020) | 1.9°F (1995) | 1.72 in (2007) |
| December 11 | 73.0°F (2020) | 9.0°F (1989) | 0.54 in (1972) |
| December 12 | 71.1°F (2015) | 3.0°F (1989) | 0.69 in (2001) |
| December 13 | 70.0°F (1975) | 1.0°F (1985) | 1.88 in (2015) |
| December 14 | 69.1°F (1975) | -2.9°F (1985) | 1.49 in (1987) |
| December 15 | 69.1°F (2021) | -7.1°F (1989) | 1.53 in (1992) |
| December 16 | 73.9°F (2021) | -9.0°F (1989) | 1.36 in (2024) |
| December 17 | 68.0°F (2006) | -0.9°F (2000) | 1.93 in (1990) |
| December 18 | 70.0°F (2006) | -2.0°F (2016) | 0.93 in (2021) |
| December 19 | 73.9°F (1978) | -2.0°F (1983) | 2.15 in (1987) |
| December 20 | 66.9°F (1997) | 1.9°F (1983) | 1.81 in (1991) |
| December 21 | 63.0°F (1979) | -8.0°F (1989) | 1.23 in (2013) |
| December 22 | 69.1°F (1982) | -15.0°F (1989) | 0.96 in (1981) |
| December 23 | 71.1°F (1982) | -17.0°F (1989) | 1.11 in (2017) |
| December 24 | 72.0°F (2025) | -11.0°F (1983) | 2.01 in (2002) |
| December 25 | 75.9°F (2025) | -13.0°F (1983) | 1.62 in (1987) |
| December 26 | 75.9°F (2025) | -2.9°F (1983) | 0.56 in (1987) |
| December 27 | 77.0°F (2025) | 10.0°F (2022) | 6.62 in (2015) |
| December 28 | 79.0°F (2025) | 3.9°F (1983) | 2.89 in (2015) |
| December 29 | 72.0°F (2025) | -9.0°F (1983) | 2.41 in (1990) |
| December 30 | 69.1°F (2022) | -7.1°F (1983) | 0.84 in (2020) |
| December 31 | 66.9°F (1999) | -6.0°F (1976) | 2.06 in (1984) |