December weather in St. Charles, MO
The average temperature in St. Charles in December is 35.2°F (26.4°F–44.1°F). Average precipitation: 2.99 inches. Average snowfall is 1.5 inches.
December is a winter month in St. Charles, and is cooler than the annual average of 55.5°F. Daily temperatures swing about 17.7°F between overnight low and afternoon high. Expect about 7 days with precipitation. Daylight averages about 9h 18m. For travel, December is cold.
Avg High
44.1°F
Avg Low
26.4°F
Precipitation
2.99 in
Snow
1.5 in
December records in St. Charles
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 69.1°F (1970) | 1.0°F (1964) | 1.92 in (2006) |
| December 2 | 75.0°F (1970) | 6.1°F (1942) | 0.88 in (1967) |
| December 3 | 73.0°F (1982) | 0.0°F (1929) | 3.40 in (1982) |
| December 4 | 75.0°F (1970) | 1.9°F (1893) | 1.68 in (1982) |
| December 5 | 75.0°F (1956) | 6.1°F (1895) | 1.50 in (1923) |
| December 6 | 72.0°F (1998) | 3.0°F (1977) | 1.06 in (1960) |
| December 7 | 73.0°F (1980) | -9.9°F (1917) | 1.80 in (2004) |
| December 8 | 73.0°F (1966) | -4.0°F (1917) | 1.60 in (1901) |
| December 9 | 73.9°F (1918) | -5.1°F (1917) | 0.76 in (2009) |
| December 10 | 69.1°F (1939) | -9.0°F (1917) | 1.72 in (1971) |
| December 11 | 70.0°F (1929) | -2.9°F (1917) | 2.04 in (1985) |
| December 12 | 71.1°F (1949) | -9.9°F (1962) | 1.05 in (1972) |
| December 13 | 72.0°F (1948) | -2.9°F (1903) | 2.23 in (1901) |
| December 14 | 69.1°F (1991) | -6.0°F (1898) | 1.35 in (1971) |
| December 15 | 77.0°F (1948) | -8.0°F (1901) | 1.60 in (1971) |
| December 16 | 72.0°F (2021) | -9.9°F (1989) | 1.36 in (1992) |
| December 17 | 71.1°F (1908) | -11.0°F (1989) | 1.37 in (2001) |
| December 18 | 70.0°F (1939) | -6.0°F (1901) | 1.69 in (1895) |
| December 19 | 66.0°F (2002) | -11.9°F (1901) | 2.77 in (1895) |
| December 20 | 66.9°F (1976) | -18.9°F (1901) | 1.30 in (2011) |
| December 21 | 69.1°F (1949) | -9.9°F (1963) | 0.93 in (2006) |
| December 22 | 66.0°F (1940) | -18.0°F (1989) | 1.18 in (1949) |
| December 23 | 69.1°F (1893) | -18.0°F (1989) | 1.12 in (1988) |
| December 24 | 73.9°F (1933) | -15.0°F (1989) | 1.44 in (1982) |
| December 25 | 73.9°F (2021) | -13.0°F (1983) | 1.03 in (2009) |
| December 26 | 71.1°F (2019) | -11.9°F (1983) | 1.05 in (2016) |
| December 27 | 72.0°F (1907) | -2.0°F (1925) | 5.86 in (2015) |
| December 28 | 71.1°F (1971) | -11.9°F (1924) | 2.80 in (2015) |
| December 29 | 75.9°F (2025) | -6.0°F (1917) | 1.55 in (2015) |
| December 30 | 70.0°F (1919) | -8.0°F (1909) | 2.47 in (1990) |
| December 31 | 71.1°F (1951) | -8.0°F (1976) | 1.50 in (2018) |