December weather in Allerton, IL
The average temperature in Allerton in December is 30.5°F (23.4°F–37.6°F). Average precipitation: 2.48 inches. Average snowfall is 6.0 inches.
December is a winter month in Allerton, and is cooler than the annual average of 51.5°F. Daily temperatures swing about 14.2°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 11m. For travel, December is cold.
Avg High
37.6°F
Avg Low
23.4°F
Precipitation
2.48 in
Snow
6.0 in
December records in Allerton
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.0°F (2012) | 10.0°F (2002) | 1.34 in (2006) |
| December 2 | 63.0°F (2012) | 8.1°F (2005) | 1.02 in (1967) |
| December 3 | 64.9°F (2012) | 12.0°F (2005) | 1.09 in (1967) |
| December 4 | 71.1°F (2012) | 10.0°F (2006) | 0.55 in (1982) |
| December 5 | 64.0°F (2017) | 3.9°F (2005) | 1.28 in (1966) |
| December 6 | 55.9°F (2021) | 1.9°F (2010) | 0.85 in (1967) |
| December 7 | 57.0°F (2004) | -2.0°F (2005) | 1.25 in (2004) |
| December 8 | 57.0°F (2023) | -2.0°F (2010) | 2.43 in (1966) |
| December 9 | 60.1°F (2024) | -5.1°F (2010) | 1.29 in (1966) |
| December 10 | 60.1°F (2024) | 5.0°F (2005) | 0.75 in (1985) |
| December 11 | 63.0°F (2021) | 7.0°F (2009) | 1.92 in (1985) |
| December 12 | 60.1°F (2020) | 12.9°F (2003) | 1.64 in (2010) |
| December 13 | 68.0°F (2015) | 3.9°F (2010) | 1.65 in (1918) |
| December 14 | 63.0°F (2015) | -2.0°F (2010) | 0.94 in (1971) |
| December 15 | 55.9°F (2006) | -5.1°F (2025) | 2.08 in (1987) |
| December 16 | 62.1°F (2021) | 3.0°F (2016) | 0.50 in (2007) |
| December 17 | 61.0°F (2024) | 10.0°F (2009) | 0.72 in (2023) |
| December 18 | 53.1°F (2002) | 0.0°F (2010) | 0.60 in (1949) |
| December 19 | 55.0°F (2002) | -2.9°F (2016) | 1.20 in (2008) |
| December 20 | 52.0°F (2002) | -0.9°F (2016) | 1.68 in (1957) |
| December 21 | 53.1°F (2012) | 3.9°F (2008) | 1.27 in (1967) |
| December 22 | 55.0°F (2015) | -0.9°F (2008) | 1.58 in (1949) |
| December 23 | 57.9°F (2015) | -9.0°F (2022) | 1.10 in (1981) |
| December 24 | 62.1°F (2015) | -7.1°F (2022) | 1.08 in (2008) |
| December 25 | 64.0°F (2023) | -2.0°F (2004) | 0.90 in (1951) |
| December 26 | 62.1°F (2025) | 3.9°F (2017) | 0.55 in (1957) |
| December 27 | 64.9°F (2025) | -9.9°F (2017) | 3.28 in (2015) |
| December 28 | 63.0°F (2008) | -9.0°F (2017) | 1.30 in (1988) |
| December 29 | 69.1°F (2025) | 3.9°F (2009) | 1.25 in (2003) |
| December 30 | 59.0°F (2019) | 3.9°F (2009) | 2.07 in (1990) |
| December 31 | 55.9°F (2002) | -2.0°F (2017) | 0.98 in (1972) |