December weather in Summit, IL
The average temperature in Summit in December is 31.3°F (25.0°F–37.6°F). Average precipitation: 1.79 inches.
December is a winter month in Summit, and is cooler than the annual average of 52.1°F. Daily temperatures swing about 12.6°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 8h 59m. For travel, December is cold.
Avg High
37.6°F
Avg Low
25.0°F
Precipitation
1.79 in
Daylight
8h 59m
December records in Summit
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (2012) | 14.0°F (2002) | 0.81 in (2018) |
| December 2 | 66.0°F (2012) | 12.0°F (2005) | 0.24 in (2007) |
| December 3 | 72.0°F (2012) | 13.1°F (2006) | 0.39 in (1999) |
| December 4 | 68.0°F (1998) | 9.0°F (2025) | 0.79 in (1999) |
| December 5 | 68.0°F (2001) | 7.0°F (2005) | 0.85 in (1999) |
| December 6 | 63.0°F (1998) | 5.0°F (2005) | 1.15 in (1998) |
| December 7 | 53.1°F (2023) | 0.0°F (2005) | 1.02 in (2004) |
| December 8 | 57.0°F (2024) | 7.2°F (2006) | 0.43 in (2005) |
| December 9 | 57.0°F (2023) | 3.2°F (2013) | 0.93 in (2008) |
| December 10 | 61.0°F (2021) | 1.2°F (2013) | 0.80 in (2021) |
| December 11 | 59.0°F (2021) | 2.1°F (2013) | 1.00 in (2000) |
| December 12 | 60.1°F (2015) | -2.7°F (2013) | 0.76 in (2020) |
| December 13 | 64.0°F (2015) | -2.9°F (2000) | 0.78 in (2015) |
| December 14 | 62.1°F (2015) | -0.9°F (2025) | 1.04 in (2022) |
| December 15 | 66.0°F (2021) | 1.2°F (2016) | 0.21 in (2012) |
| December 16 | 66.9°F (2021) | 6.3°F (2009) | 0.48 in (2023) |
| December 17 | 60.1°F (2018) | 1.9°F (2000) | 0.10 in (2001) |
| December 18 | 55.0°F (2002) | -4.9°F (2016) | 1.03 in (2002) |
| December 19 | 55.0°F (2002) | -5.8°F (2016) | 0.85 in (2008) |
| December 20 | 51.1°F (2015) | -0.9°F (2000) | 1.12 in (2012) |
| December 21 | 54.0°F (2006) | -4.9°F (2008) | 0.72 in (2015) |
| December 22 | 55.9°F (2006) | -7.1°F (2000) | 0.85 in (2006) |
| December 23 | 61.0°F (2015) | -8.9°F (2022) | 0.84 in (2015) |
| December 24 | 57.9°F (2021) | -2.0°F (2004) | 0.35 in (2009) |
| December 25 | 61.0°F (2019) | 0.0°F (2000) | 0.37 in (2009) |
| December 26 | 62.1°F (2019) | -0.8°F (2017) | 0.24 in (2015) |
| December 27 | 62.1°F (2008) | -2.7°F (2017) | 1.63 in (2008) |
| December 28 | 59.0°F (2025) | 2.1°F (2017) | 1.82 in (2015) |
| December 29 | 57.9°F (2019) | 9.0°F (1998) | 0.88 in (2024) |
| December 30 | 60.1°F (2002) | 0.1°F (2017) | 0.38 in (2011) |
| December 31 | 59.0°F (2006) | 0.1°F (2017) | 1.05 in (2010) |