December weather in Mercer, MO
The average temperature in Mercer in December is 29.1°F (20.1°F–38.1°F). Average precipitation: 1.42 inches.
December is a winter month in Mercer, and is cooler than the annual average of 51.1°F. Daily temperatures swing about 18°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 7m. For travel, December is cold.
Avg High
38.1°F
Avg Low
20.1°F
Precipitation
1.42 in
Daylight
9h 7m
December records in Mercer
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 66.9°F (1962) | -2.0°F (1893) | 1.29 in (1986) |
| December 2 | 68.0°F (1956) | -4.0°F (1985) | 0.69 in (2007) |
| December 3 | 68.0°F (1962) | -5.1°F (1985) | 1.15 in (1902) |
| December 4 | 70.0°F (2012) | 1.0°F (2025) | 1.02 in (2008) |
| December 5 | 69.1°F (2017) | -4.0°F (1964) | 0.75 in (1960) |
| December 6 | 70.0°F (2001) | -2.9°F (1972) | 0.78 in (1994) |
| December 7 | 66.9°F (1894) | -7.1°F (1976) | 3.00 in (1980) |
| December 8 | 61.0°F (1984) | -5.1°F (1898) | 1.03 in (1980) |
| December 9 | 62.1°F (1990) | -5.1°F (1977) | 0.64 in (1899) |
| December 10 | 62.1°F (2020) | -6.0°F (1977) | 0.75 in (1964) |
| December 11 | 66.9°F (1965) | -16.1°F (1972) | 1.08 in (1899) |
| December 12 | 64.0°F (1965) | -11.9°F (1989) | 1.00 in (1901) |
| December 13 | 63.0°F (1975) | -20.0°F (1961) | 1.34 in (2022) |
| December 14 | 64.9°F (1894) | -15.0°F (1985) | 1.73 in (2015) |
| December 15 | 64.0°F (2021) | -18.0°F (1963) | 1.15 in (1971) |
| December 16 | 73.0°F (2021) | -11.0°F (1963) | 0.50 in (2014) |
| December 17 | 64.0°F (2006) | -6.0°F (1964) | 0.95 in (1895) |
| December 18 | 59.0°F (1962) | -16.1°F (1985) | 0.42 in (1968) |
| December 19 | 57.9°F (1966) | -20.9°F (1983) | 0.56 in (1968) |
| December 20 | 63.0°F (2002) | -17.0°F (1901) | 0.97 in (2012) |
| December 21 | 60.1°F (1967) | -18.0°F (1989) | 1.15 in (1898) |
| December 22 | 64.0°F (1893) | -23.1°F (1989) | 0.88 in (2013) |
| December 23 | 63.0°F (1893) | -25.1°F (1989) | 0.51 in (2007) |
| December 24 | 63.0°F (1893) | -20.9°F (2013) | 1.21 in (1965) |
| December 25 | 64.0°F (2021) | -18.9°F (1983) | 1.05 in (2009) |
| December 26 | 62.1°F (2019) | -23.1°F (1962) | 0.40 in (2016) |
| December 27 | 62.1°F (1976) | -11.9°F (2017) | 1.48 in (1959) |
| December 28 | 70.0°F (1984) | -11.9°F (2017) | 1.35 in (2025) |
| December 29 | 66.9°F (1984) | -9.0°F (1983) | 0.57 in (2019) |
| December 30 | 64.9°F (2022) | -18.0°F (1961) | 1.17 in (2020) |
| December 31 | 66.9°F (2004) | -17.0°F (1976) | 0.65 in (2006) |