December weather in Lake Geneva, WI
The average temperature in Lake Geneva in December is 27.8°F (20.5°F–35.1°F). Average precipitation: 2.31 inches. Average snowfall is 7.1 inches.
December is a winter month in Lake Geneva, and is cooler than the annual average of 49.4°F. Daily temperatures swing about 14.6°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 8h 53m. For travel, December is cold.
Avg High
35.1°F
Avg Low
20.5°F
Precipitation
2.31 in
Snow
7.1 in
December records in Lake Geneva
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 61.0°F (1970) | 3.0°F (2025) | 1.45 in (1985) |
| December 2 | 63.0°F (1982) | -5.1°F (1976) | 2.65 in (1982) |
| December 3 | 64.0°F (1998) | 1.0°F (1985) | 0.88 in (1990) |
| December 4 | 60.1°F (1998) | 0.0°F (1991) | 1.55 in (1973) |
| December 5 | 66.9°F (2001) | -2.0°F (2025) | 0.98 in (1999) |
| December 6 | 61.0°F (2001) | -2.0°F (1977) | 0.45 in (1998) |
| December 7 | 57.0°F (1946) | -8.0°F (1972) | 1.02 in (1980) |
| December 8 | 59.0°F (1946) | 0.0°F (1958) | 0.67 in (1977) |
| December 9 | 57.9°F (1946) | -11.0°F (1958) | 0.45 in (2023) |
| December 10 | 55.0°F (1946) | -8.0°F (1978) | 1.33 in (1971) |
| December 11 | 59.0°F (1949) | -7.1°F (1972) | 1.16 in (2021) |
| December 12 | 57.0°F (1949) | -9.0°F (1962) | 1.50 in (2020) |
| December 13 | 55.9°F (1975) | -6.0°F (2000) | 0.52 in (1975) |
| December 14 | 55.9°F (1975) | -11.0°F (1985) | 0.46 in (1984) |
| December 15 | 55.0°F (1971) | -9.9°F (1989) | 1.78 in (1971) |
| December 16 | 57.0°F (1984) | -11.0°F (1951) | 0.31 in (1970) |
| December 17 | 52.0°F (1962) | -9.0°F (1945) | 0.54 in (1994) |
| December 18 | 53.1°F (2002) | -14.1°F (1945) | 0.79 in (1957) |
| December 19 | 57.9°F (2002) | -18.9°F (1983) | 1.14 in (1968) |
| December 20 | 54.0°F (1967) | -11.9°F (1963) | 1.15 in (1952) |
| December 21 | 55.0°F (1967) | -18.0°F (1989) | 0.62 in (1949) |
| December 22 | 51.1°F (1957) | -14.1°F (1989) | 0.52 in (1956) |
| December 23 | 52.0°F (1979) | -17.0°F (1983) | 0.98 in (1959) |
| December 24 | 55.9°F (1955) | -23.1°F (1983) | 1.50 in (1965) |
| December 25 | 57.0°F (1982) | -15.0°F (1983) | 0.44 in (1957) |
| December 26 | 54.0°F (2023) | -11.9°F (1962) | 0.67 in (1988) |
| December 27 | 52.0°F (1946) | -14.1°F (1950) | 1.22 in (1954) |
| December 28 | 57.0°F (1982) | -9.9°F (1961) | 0.81 in (1987) |
| December 29 | 59.0°F (1984) | -9.9°F (1976) | 1.20 in (2019) |
| December 30 | 55.9°F (2022) | -9.0°F (1963) | 0.80 in (1972) |
| December 31 | 54.0°F (1965) | -15.0°F (1967) | 0.95 in (1978) |