December weather in South Jacksonville, IL
The average temperature in South Jacksonville in December is 31.4°F (22.9°F–39.9°F). Average precipitation: 2.35 inches.
December is a winter month in South Jacksonville, and is cooler than the annual average of 52.8°F. Daily temperatures swing about 17°F between overnight low and afternoon high. Expect about 9 days with precipitation. Daylight averages about 9h 12m. For travel, December is cold.
Avg High
39.9°F
Avg Low
22.9°F
Precipitation
2.35 in
Daylight
9h 12m
December records in South Jacksonville
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (2012) | 15.1°F (2022) | 2.13 in (2006) |
| December 2 | 64.0°F (2012) | 8.1°F (2006) | 0.19 in (2025) |
| December 3 | 70.0°F (2012) | 8.1°F (2006) | 0.71 in (2007) |
| December 4 | 72.0°F (2012) | 3.0°F (2006) | 0.49 in (2012) |
| December 5 | 66.0°F (2017) | 6.1°F (2025) | 0.36 in (2016) |
| December 6 | 59.0°F (2019) | 7.0°F (2006) | 0.53 in (2004) |
| December 7 | 52.0°F (2012) | 7.0°F (2013) | 0.65 in (2004) |
| December 8 | 64.0°F (2023) | 1.0°F (2006) | 0.12 in (2007) |
| December 9 | 64.0°F (2024) | 3.0°F (2006) | 1.26 in (2007) |
| December 10 | 62.1°F (2020) | 7.0°F (2013) | 0.69 in (2003) |
| December 11 | 64.9°F (2020) | 8.1°F (2009) | 0.42 in (2007) |
| December 12 | 55.0°F (2015) | 3.9°F (2013) | 0.94 in (2007) |
| December 13 | 68.0°F (2015) | 3.0°F (2010) | 0.16 in (2015) |
| December 14 | 62.1°F (2015) | -4.0°F (2025) | 1.20 in (2015) |
| December 15 | 60.1°F (2021) | -4.0°F (2025) | 1.05 in (2024) |
| December 16 | 69.1°F (2021) | 6.1°F (2016) | 0.37 in (2007) |
| December 17 | 64.0°F (2006) | 6.1°F (2007) | 0.30 in (1949) |
| December 18 | 52.0°F (2024) | -2.0°F (2016) | 0.42 in (2021) |
| December 19 | 54.0°F (2012) | -4.0°F (2016) | 0.71 in (2008) |
| December 20 | 53.1°F (2018) | -2.9°F (2016) | 1.26 in (2011) |
| December 21 | 57.0°F (2013) | 0.0°F (2008) | 1.99 in (1949) |
| December 22 | 62.1°F (2015) | 0.0°F (2008) | 0.51 in (2013) |
| December 23 | 55.9°F (2007) | -9.9°F (2022) | 0.64 in (2003) |
| December 24 | 62.1°F (2025) | -9.9°F (2022) | 1.30 in (2009) |
| December 25 | 66.9°F (2021) | 1.9°F (2013) | 1.39 in (2009) |
| December 26 | 64.0°F (2019) | 3.9°F (2022) | 0.50 in (2016) |
| December 27 | 64.0°F (2019) | -5.1°F (2017) | 2.38 in (2015) |
| December 28 | 63.0°F (2008) | -5.1°F (2017) | 1.17 in (2008) |
| December 29 | 70.0°F (2025) | 6.1°F (2017) | 0.84 in (2019) |
| December 30 | 64.9°F (2022) | 1.9°F (2013) | 0.65 in (2019) |
| December 31 | 57.0°F (2022) | -0.9°F (2017) | 1.09 in (2018) |