December weather in Fairmont City, IL
The average temperature in Fairmont City in December is 36.4°F (28.6°F–44.3°F). Average precipitation: 2.32 inches.
December is a winter month in Fairmont City, and is cooler than the annual average of 56.5°F. Daily temperatures swing about 15.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 19m. For travel, December is cold.
Avg High
44.3°F
Avg Low
28.6°F
Precipitation
2.32 in
Daylight
9h 19m
December records in Fairmont City
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (2012) | 19.0°F (2002) | 0.68 in (2018) |
| December 2 | 73.9°F (2012) | 18.1°F (2006) | 0.29 in (2007) |
| December 3 | 75.0°F (2021) | 16.2°F (2006) | 0.27 in (1999) |
| December 4 | 72.0°F (2001) | 12.9°F (2025) | 0.60 in (2011) |
| December 5 | 71.1°F (1998) | 10.0°F (2025) | 2.01 in (2014) |
| December 6 | 72.0°F (1998) | 10.9°F (2002) | 1.18 in (2004) |
| December 7 | 66.9°F (2023) | 10.2°F (2013) | 0.44 in (2004) |
| December 8 | 63.0°F (2015) | 11.1°F (2006) | 0.62 in (2009) |
| December 9 | 66.9°F (2020) | 6.1°F (2005) | 1.14 in (1999) |
| December 10 | 71.1°F (2021) | 10.0°F (2005) | 0.21 in (1999) |
| December 11 | 66.9°F (2021) | 11.1°F (2013) | 0.61 in (2020) |
| December 12 | 73.0°F (2015) | 6.3°F (2013) | 0.90 in (2001) |
| December 13 | 66.9°F (2015) | 5.2°F (2010) | 0.62 in (2000) |
| December 14 | 66.9°F (2021) | 3.2°F (2010) | 1.23 in (2024) |
| December 15 | 68.0°F (2021) | 10.0°F (2025) | 0.51 in (2018) |
| December 16 | 68.0°F (2021) | 7.0°F (2000) | 1.34 in (2001) |
| December 17 | 64.0°F (2006) | 1.9°F (2000) | 0.46 in (2021) |
| December 18 | 62.1°F (2002) | 5.0°F (2000) | 0.66 in (2002) |
| December 19 | 61.0°F (1997) | 1.9°F (2000) | 0.52 in (2011) |
| December 20 | 70.0°F (2013) | -5.1°F (2000) | 0.50 in (2012) |
| December 21 | 64.9°F (2015) | 5.2°F (2008) | 0.84 in (2013) |
| December 22 | 55.9°F (2003) | -4.9°F (2022) | 0.55 in (2014) |
| December 23 | 70.0°F (2025) | -4.9°F (2022) | 1.19 in (2015) |
| December 24 | 70.0°F (2021) | 1.0°F (2000) | 1.26 in (2009) |
| December 25 | 70.0°F (2025) | 1.9°F (2000) | 0.55 in (2023) |
| December 26 | 71.1°F (2025) | 7.0°F (2000) | 2.21 in (2015) |
| December 27 | 69.1°F (2008) | 3.2°F (2017) | 1.57 in (2015) |
| December 28 | 78.1°F (2025) | 0.0°F (2000) | 2.13 in (2015) |
| December 29 | 63.0°F (2022) | 13.1°F (2017) | 0.54 in (2019) |
| December 30 | 66.0°F (2002) | 6.3°F (2017) | 1.03 in (2022) |
| December 31 | 70.0°F (2004) | 4.1°F (2017) | 1.16 in (2018) |