December weather in South Wilmington, IL
The average temperature in South Wilmington in December is 27.8°F (19.6°F–36.1°F). Average precipitation: 1.95 inches. Average snowfall is 5.6 inches.
December is a winter month in South Wilmington, and is cooler than the annual average of 49.3°F. Daily temperatures swing about 16.5°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 3m. For travel, December is cold.
Avg High
36.1°F
Avg Low
19.6°F
Precipitation
1.95 in
Snow
5.6 in
December records in South Wilmington
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (1998) | 10.9°F (2002) | 1.25 in (2006) |
| December 2 | 60.1°F (2012) | 8.1°F (2005) | 1.12 in (2018) |
| December 3 | 64.0°F (2012) | 7.0°F (2002) | 0.56 in (1991) |
| December 4 | 69.1°F (2012) | -2.0°F (1991) | 0.25 in (1999) |
| December 5 | 66.9°F (1998) | -6.0°F (2025) | 0.85 in (1999) |
| December 6 | 66.9°F (2001) | -0.9°F (2005) | 0.35 in (2004) |
| December 7 | 55.0°F (1998) | -6.0°F (2005) | 1.65 in (1998) |
| December 8 | 53.1°F (2023) | -7.1°F (2005) | 0.22 in (2004) |
| December 9 | 64.0°F (1991) | -5.1°F (1995) | 0.62 in (2009) |
| December 10 | 55.9°F (2020) | -5.1°F (1995) | 0.70 in (2003) |
| December 11 | 60.1°F (2020) | -8.0°F (1995) | 0.78 in (2007) |
| December 12 | 57.0°F (1990) | -4.0°F (2013) | 1.00 in (2020) |
| December 13 | 64.0°F (2015) | -13.0°F (2000) | 0.42 in (1991) |
| December 14 | 60.1°F (2015) | -5.1°F (2025) | 0.85 in (2015) |
| December 15 | 55.0°F (2011) | -5.1°F (2010) | 1.70 in (2011) |
| December 16 | 64.0°F (2021) | -2.0°F (2010) | 0.82 in (1992) |
| December 17 | 55.0°F (2015) | 5.0°F (2000) | 0.41 in (2023) |
| December 18 | 52.0°F (2002) | -4.0°F (2000) | 0.50 in (2021) |
| December 19 | 54.0°F (1998) | -9.9°F (2016) | 0.90 in (2008) |
| December 20 | 52.0°F (2017) | -9.9°F (2000) | 0.78 in (2012) |
| December 21 | 50.0°F (2015) | -4.0°F (2008) | 0.81 in (2006) |
| December 22 | 55.0°F (2015) | -9.0°F (2000) | 1.00 in (2006) |
| December 23 | 52.0°F (2015) | -11.0°F (2000) | 0.56 in (2023) |
| December 24 | 59.0°F (2020) | -6.0°F (2000) | 0.90 in (1996) |
| December 25 | 57.0°F (2021) | -13.0°F (2000) | 1.65 in (2002) |
| December 26 | 62.1°F (2019) | -11.9°F (2000) | 0.30 in (2016) |
| December 27 | 62.1°F (2019) | -11.0°F (2017) | 1.40 in (2015) |
| December 28 | 61.0°F (2008) | -11.9°F (2017) | 1.61 in (1990) |
| December 29 | 63.0°F (2025) | 0.0°F (1993) | 1.57 in (2015) |
| December 30 | 59.0°F (2022) | -6.0°F (1998) | 0.61 in (1992) |
| December 31 | 59.0°F (2002) | -9.0°F (2017) | 1.10 in (2010) |