December weather in South Lyon, MI
The average temperature in South Lyon in December is 28.4°F (21.6°F–35.3°F). Average precipitation: 2.11 inches.
December is a winter month in South Lyon, and is cooler than the annual average of 47.1°F. Daily temperatures swing about 13.7°F between overnight low and afternoon high. Daylight averages about 8h 54m. For travel, December is cold.
Avg High
35.3°F
Avg Low
21.6°F
Precipitation
2.11 in
Daylight
8h 54m
December records in South Lyon
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.0°F (2014) | 9.0°F (2025) | 0.58 in (2008) |
| December 2 | 54.0°F (2012) | 9.0°F (2025) | 0.67 in (2023) |
| December 3 | 57.0°F (2018) | 15.1°F (2025) | 0.70 in (2009) |
| December 4 | 60.1°F (2012) | 14.0°F (2025) | 0.28 in (2023) |
| December 5 | 57.0°F (2013) | -2.0°F (2025) | 0.30 in (2012) |
| December 6 | 45.0°F (2013) | 6.1°F (2007) | 0.44 in (2021) |
| December 7 | 43.0°F (2022) | 8.1°F (2007) | 0.12 in (2008) |
| December 8 | 46.9°F (2015) | 3.0°F (2025) | 0.22 in (2012) |
| December 9 | 53.1°F (2023) | 3.9°F (2025) | 0.10 in (2014) |
| December 10 | 60.1°F (2023) | 6.1°F (2010) | 0.77 in (2008) |
| December 11 | 59.0°F (2021) | 6.1°F (2013) | 0.94 in (2021) |
| December 12 | 57.9°F (2021) | -0.9°F (2013) | 0.50 in (2010) |
| December 13 | 60.1°F (2015) | 7.0°F (2013) | 0.48 in (2010) |
| December 14 | 60.1°F (2015) | 1.9°F (2025) | 0.36 in (2017) |
| December 15 | 57.9°F (2015) | 3.0°F (2016) | 0.58 in (2011) |
| December 16 | 57.9°F (2015) | 1.0°F (2016) | 0.10 in (2011) |
| December 17 | 60.1°F (2021) | -0.9°F (2013) | 0.50 in (2014) |
| December 18 | 45.0°F (2023) | 7.0°F (2010) | 0.19 in (2023) |
| December 19 | 51.1°F (2025) | -6.0°F (2016) | 0.47 in (2025) |
| December 20 | 46.0°F (2017) | 10.9°F (2019) | 0.67 in (2008) |
| December 21 | 45.0°F (2012) | 9.0°F (2016) | 0.69 in (2012) |
| December 22 | 48.9°F (2015) | 1.9°F (2008) | 1.00 in (2013) |
| December 23 | 53.1°F (2019) | 1.0°F (2008) | 0.74 in (2022) |
| December 24 | 60.1°F (2015) | -2.0°F (2022) | 0.40 in (2008) |
| December 25 | 48.9°F (2021) | 3.9°F (2022) | 0.66 in (2014) |
| December 26 | 54.0°F (2019) | -8.0°F (2017) | 0.78 in (2009) |
| December 27 | 55.0°F (2019) | -11.0°F (2017) | 0.58 in (2012) |
| December 28 | 60.1°F (2008) | -17.0°F (2017) | 0.28 in (2011) |
| December 29 | 54.0°F (2018) | 5.0°F (2012) | 0.74 in (2019) |
| December 30 | 52.0°F (2022) | 9.0°F (2009) | 0.86 in (2024) |
| December 31 | 51.1°F (2022) | -6.0°F (2017) | 0.68 in (2022) |