December weather in Oconomowoc Lake, WI
The average temperature in Oconomowoc Lake in December is 25.9°F (18.0°F–33.7°F). Average precipitation: 1.87 inches. Average snowfall is 10.2 inches.
December is a winter month in Oconomowoc Lake, and is cooler than the annual average of 47.2°F. Daily temperatures swing about 15.7°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 8h 49m. For travel, December is cold.
Avg High
33.7°F
Avg Low
18.0°F
Precipitation
1.87 in
Snow
10.2 in
December records in Oconomowoc Lake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.0°F (1970) | -14.1°F (1893) | 0.82 in (1985) |
| December 2 | 64.0°F (1982) | -14.1°F (1893) | 1.40 in (2007) |
| December 3 | 61.0°F (1998) | -9.0°F (1895) | 0.76 in (1978) |
| December 4 | 64.9°F (2012) | -14.1°F (1893) | 0.66 in (2011) |
| December 5 | 62.1°F (2017) | -5.1°F (2005) | 0.71 in (1948) |
| December 6 | 66.9°F (2001) | -8.0°F (2007) | 0.37 in (1987) |
| December 7 | 55.9°F (1946) | -11.0°F (1972) | 0.70 in (1998) |
| December 8 | 60.1°F (1946) | -8.0°F (1976) | 0.85 in (1966) |
| December 9 | 59.0°F (1946) | -11.9°F (1958) | 0.98 in (2009) |
| December 10 | 55.0°F (2024) | -15.0°F (1977) | 1.26 in (2003) |
| December 11 | 57.9°F (1949) | -16.1°F (1977) | 1.01 in (2021) |
| December 12 | 57.9°F (1949) | -9.0°F (1962) | 0.80 in (2010) |
| December 13 | 57.0°F (2015) | -16.1°F (1893) | 0.51 in (2001) |
| December 14 | 61.0°F (2015) | -15.0°F (1945) | 1.42 in (2015) |
| December 15 | 60.1°F (1975) | -11.9°F (1958) | 1.64 in (1971) |
| December 16 | 64.9°F (2021) | -11.9°F (1951) | 0.85 in (1992) |
| December 17 | 51.1°F (2015) | -15.0°F (1983) | 0.40 in (2016) |
| December 18 | 48.0°F (1957) | -22.0°F (1983) | 0.39 in (1895) |
| December 19 | 53.1°F (2002) | -18.9°F (1983) | 0.96 in (1987) |
| December 20 | 53.1°F (1894) | -18.9°F (1989) | 0.87 in (2012) |
| December 21 | 54.0°F (1967) | -18.9°F (1989) | 1.07 in (2012) |
| December 22 | 52.0°F (1957) | -20.0°F (1983) | 0.48 in (2006) |
| December 23 | 53.1°F (2019) | -25.1°F (1983) | 1.06 in (2006) |
| December 24 | 57.0°F (1982) | -22.0°F (1983) | 0.88 in (1979) |
| December 25 | 57.9°F (1982) | -20.9°F (2000) | 1.10 in (2009) |
| December 26 | 55.9°F (2019) | -22.0°F (2000) | 1.18 in (1988) |
| December 27 | 55.0°F (1982) | -20.9°F (1950) | 0.90 in (1959) |
| December 28 | 62.1°F (1984) | -13.0°F (2000) | 0.99 in (2008) |
| December 29 | 50.0°F (2019) | -15.0°F (1976) | 1.20 in (2015) |
| December 30 | 55.9°F (2022) | -13.0°F (1946) | 1.04 in (1972) |
| December 31 | 55.0°F (2002) | -18.0°F (1976) | 0.79 in (1984) |