December weather in Mequon, WI
The average temperature in Mequon in December is 25.4°F (17.9°F–33.0°F). Average precipitation: 1.73 inches. Average snowfall is 10.3 inches.
December is a winter month in Mequon, and is cooler than the annual average of 45.8°F. Daily temperatures swing about 15.1°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 8h 49m. For travel, December is cold.
Avg High
33.0°F
Avg Low
17.9°F
Precipitation
1.73 in
Snow
10.3 in
December records in Mequon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1970) | -11.0°F (1976) | 0.76 in (2015) |
| December 2 | 62.1°F (1970) | -8.0°F (1976) | 0.70 in (1985) |
| December 3 | 62.1°F (1982) | -13.0°F (1976) | 1.07 in (1982) |
| December 4 | 64.0°F (1998) | 0.0°F (1976) | 0.80 in (1990) |
| December 5 | 62.1°F (2017) | -0.9°F (2005) | 1.34 in (1973) |
| December 6 | 66.9°F (2001) | -6.0°F (2007) | 0.50 in (1966) |
| December 7 | 61.0°F (1946) | -15.0°F (1972) | 0.65 in (1998) |
| December 8 | 61.0°F (1946) | -9.9°F (1972) | 0.70 in (1966) |
| December 9 | 60.1°F (1946) | -8.0°F (1995) | 1.13 in (2009) |
| December 10 | 54.0°F (2024) | -8.0°F (1977) | 1.15 in (2003) |
| December 11 | 57.9°F (1949) | -15.0°F (1972) | 0.98 in (1965) |
| December 12 | 57.9°F (1949) | -9.9°F (1976) | 0.90 in (2010) |
| December 13 | 55.9°F (1991) | -9.0°F (1961) | 0.48 in (2015) |
| December 14 | 60.1°F (2015) | -11.9°F (1985) | 1.61 in (2015) |
| December 15 | 57.9°F (1975) | -15.0°F (1985) | 1.80 in (1971) |
| December 16 | 64.9°F (2021) | -9.9°F (1951) | 0.91 in (1992) |
| December 17 | 55.0°F (1984) | -11.9°F (1972) | 0.28 in (2016) |
| December 18 | 51.1°F (2006) | -16.1°F (1983) | 0.50 in (1957) |
| December 19 | 52.0°F (2002) | -22.0°F (1983) | 3.20 in (2000) |
| December 20 | 51.1°F (1967) | -20.0°F (1983) | 1.08 in (1987) |
| December 21 | 54.0°F (1967) | -18.9°F (1989) | 1.54 in (2012) |
| December 22 | 53.1°F (2019) | -18.9°F (1989) | 0.43 in (2015) |
| December 23 | 48.9°F (1957) | -20.0°F (1983) | 1.04 in (2006) |
| December 24 | 55.0°F (2015) | -25.1°F (1983) | 0.92 in (1965) |
| December 25 | 57.0°F (1982) | -22.0°F (1983) | 0.95 in (1979) |
| December 26 | 59.0°F (1982) | -18.9°F (2000) | 1.17 in (2009) |
| December 27 | 51.1°F (2008) | -16.1°F (1950) | 1.16 in (1988) |
| December 28 | 53.1°F (1982) | -11.0°F (1961) | 0.72 in (1946) |
| December 29 | 63.0°F (1984) | -15.0°F (1976) | 1.60 in (2021) |
| December 30 | 55.9°F (2022) | -11.9°F (1963) | 1.04 in (1972) |
| December 31 | 55.0°F (2004) | -14.1°F (1976) | 0.35 in (2005) |