December weather in Mason, WI
The average temperature in Mason in December is 20.1°F (12.6°F–27.6°F). Average precipitation: 0.98 inches.
December is a winter month in Mason, and is cooler than the annual average of 41.5°F. Daily temperatures swing about 15°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 8h 24m. For travel, December is cold.
Avg High
27.6°F
Avg Low
12.6°F
Precipitation
0.98 in
Daylight
8h 24m
December records in Mason
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 52.0°F (1998) | -6.9°F (2014) | 0.61 in (2007) |
| December 2 | 46.9°F (2017) | -0.9°F (2002) | 0.22 in (2004) |
| December 3 | 57.0°F (1998) | -6.0°F (2004) | 0.31 in (2013) |
| December 4 | 52.0°F (2015) | -9.0°F (2025) | 0.92 in (2017) |
| December 5 | 55.9°F (2001) | -2.0°F (2005) | 0.64 in (1998) |
| December 6 | 44.1°F (2012) | -13.9°F (2007) | 0.05 in (2022) |
| December 7 | 48.9°F (2023) | -18.8°F (2013) | 0.27 in (2024) |
| December 8 | 48.9°F (2023) | -15.9°F (2013) | 0.42 in (2003) |
| December 9 | 48.9°F (2020) | -9.8°F (2013) | 0.07 in (2003) |
| December 10 | 46.9°F (2020) | -9.8°F (2019) | 0.59 in (2015) |
| December 11 | 46.9°F (1998) | -13.9°F (2019) | 0.15 in (2016) |
| December 12 | 48.9°F (1998) | -11.7°F (2024) | 0.28 in (2006) |
| December 13 | 46.0°F (2021) | -11.9°F (2025) | 0.27 in (2015) |
| December 14 | 54.0°F (2023) | -9.0°F (2025) | 1.32 in (2022) |
| December 15 | 55.0°F (2021) | -13.9°F (2010) | 0.57 in (2014) |
| December 16 | 55.0°F (2021) | -17.9°F (2008) | 0.36 in (2000) |
| December 17 | 44.1°F (2025) | -11.7°F (2008) | 0.48 in (2023) |
| December 18 | 44.1°F (2025) | -16.8°F (2008) | 0.11 in (2000) |
| December 19 | 43.0°F (2006) | -11.9°F (2004) | 0.39 in (2022) |
| December 20 | 43.0°F (2006) | -9.0°F (1999) | 0.16 in (2008) |
| December 21 | 43.0°F (2003) | -11.9°F (1999) | 0.39 in (2022) |
| December 22 | 45.0°F (2019) | -13.9°F (2008) | 0.73 in (2013) |
| December 23 | 46.0°F (2023) | -15.0°F (2004) | 0.66 in (2015) |
| December 24 | 51.1°F (2023) | -18.9°F (2004) | 0.30 in (2009) |
| December 25 | 50.0°F (2023) | -15.0°F (2000) | 1.06 in (2023) |
| December 26 | 48.9°F (2011) | -16.8°F (2017) | 0.39 in (2015) |
| December 27 | 45.0°F (2024) | -17.9°F (2017) | 0.38 in (2024) |
| December 28 | 44.1°F (2003) | -15.9°F (2017) | 0.17 in (2024) |
| December 29 | 45.0°F (1999) | -13.9°F (2013) | 0.22 in (2006) |
| December 30 | 44.1°F (2004) | -19.8°F (2013) | 0.54 in (2010) |
| December 31 | 44.1°F (2004) | -18.8°F (2013) | 0.79 in (2006) |