December weather in DeForest, WI
The average temperature in DeForest in December is 23.8°F (15.7°F–31.9°F). Average precipitation: 1.45 inches. Average snowfall is 10.7 inches.
December is a winter month in DeForest, and is cooler than the annual average of 46°F. Daily temperatures swing about 16.2°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 49m. For travel, December is cold.
Avg High
31.9°F
Avg Low
15.7°F
Precipitation
1.45 in
Snow
10.7 in
December records in DeForest
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 59.0°F (1962) | -4.0°F (1976) | 1.31 in (2007) |
| December 2 | 63.0°F (1962) | -13.0°F (1976) | 1.88 in (1982) |
| December 3 | 62.1°F (1962) | -9.9°F (1985) | 1.40 in (1990) |
| December 4 | 63.0°F (2012) | -8.0°F (2025) | 0.82 in (2011) |
| December 5 | 63.0°F (2001) | -9.0°F (2005) | 0.74 in (1982) |
| December 6 | 53.1°F (1975) | -11.9°F (2005) | 0.50 in (1992) |
| December 7 | 48.0°F (1963) | -11.9°F (2005) | 1.18 in (1967) |
| December 8 | 50.0°F (1999) | -9.0°F (1976) | 1.19 in (1966) |
| December 9 | 55.9°F (2023) | -11.0°F (1977) | 1.30 in (2003) |
| December 10 | 51.1°F (1979) | -15.0°F (2013) | 0.58 in (1971) |
| December 11 | 55.9°F (2015) | -14.1°F (1972) | 0.99 in (1965) |
| December 12 | 52.0°F (1965) | -11.0°F (1962) | 0.62 in (2010) |
| December 13 | 54.0°F (1975) | -9.9°F (1985) | 0.39 in (2015) |
| December 14 | 60.1°F (2015) | -15.0°F (1985) | 1.26 in (2015) |
| December 15 | 55.9°F (2015) | -13.0°F (2010) | 1.40 in (1971) |
| December 16 | 66.9°F (2021) | -11.0°F (1989) | 0.48 in (1992) |
| December 17 | 50.0°F (2015) | -13.0°F (1964) | 0.20 in (1967) |
| December 18 | 52.0°F (2002) | -23.1°F (1983) | 0.31 in (2002) |
| December 19 | 48.0°F (1988) | -26.0°F (1983) | 1.10 in (1968) |
| December 20 | 51.1°F (1967) | -18.9°F (1989) | 0.45 in (2012) |
| December 21 | 52.0°F (1967) | -22.0°F (1989) | 1.00 in (2012) |
| December 22 | 54.0°F (2019) | -18.0°F (1989) | 1.25 in (2007) |
| December 23 | 55.0°F (2019) | -20.9°F (1983) | 0.61 in (1979) |
| December 24 | 55.0°F (2015) | -25.1°F (1983) | 0.55 in (1965) |
| December 25 | 55.0°F (1982) | -18.0°F (2013) | 1.05 in (2009) |
| December 26 | 55.0°F (2019) | -20.0°F (1990) | 0.49 in (2016) |
| December 27 | 53.1°F (2019) | -13.0°F (1962) | 0.55 in (1988) |
| December 28 | 57.9°F (1984) | -14.1°F (2017) | 0.48 in (2024) |
| December 29 | 62.1°F (1984) | -18.9°F (1976) | 0.83 in (2019) |
| December 30 | 55.0°F (2019) | -20.9°F (2013) | 0.78 in (1972) |
| December 31 | 54.0°F (1965) | -20.9°F (2013) | 0.21 in (1981) |