December weather in Marietta, IL
The average temperature in Marietta in December is 29.9°F (21.7°F–38.1°F). Average precipitation: 1.80 inches. Average snowfall is 5.0 inches.
December is a winter month in Marietta, and is cooler than the annual average of 51.5°F. Daily temperatures swing about 16.4°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 7m. For travel, December is cold.
Avg High
38.1°F
Avg Low
21.7°F
Precipitation
1.80 in
Snow
5.0 in
December records in Marietta
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 57.9°F (2003) | 15.1°F (2022) | 1.14 in (2006) |
| December 2 | 63.0°F (2012) | 5.0°F (2006) | 0.26 in (2018) |
| December 3 | 64.0°F (2012) | 3.9°F (2006) | 0.31 in (2023) |
| December 4 | 73.0°F (2012) | 0.0°F (2006) | 0.32 in (2011) |
| December 5 | 66.9°F (2017) | -2.0°F (2005) | 0.53 in (2016) |
| December 6 | 55.0°F (2019) | 0.0°F (2005) | 0.58 in (2004) |
| December 7 | 54.0°F (2004) | -9.9°F (2005) | 0.31 in (2004) |
| December 8 | 63.0°F (2023) | -8.0°F (2005) | 0.35 in (2004) |
| December 9 | 61.0°F (2023) | -0.9°F (2005) | 0.61 in (2022) |
| December 10 | 59.0°F (2020) | -0.9°F (2005) | 2.33 in (2003) |
| December 11 | 63.0°F (2020) | 3.0°F (2009) | 0.73 in (2007) |
| December 12 | 57.0°F (2015) | -0.9°F (2013) | 0.87 in (2020) |
| December 13 | 69.1°F (2015) | 0.0°F (2013) | 0.34 in (2001) |
| December 14 | 64.0°F (2015) | 0.0°F (2010) | 1.16 in (2015) |
| December 15 | 59.0°F (2021) | 1.0°F (2010) | 1.44 in (2011) |
| December 16 | 75.0°F (2021) | 5.0°F (2016) | 0.31 in (2023) |
| December 17 | 60.1°F (2006) | 5.0°F (2008) | 0.16 in (2008) |
| December 18 | 55.0°F (2024) | -5.1°F (2016) | 0.75 in (2002) |
| December 19 | 52.0°F (2012) | -5.1°F (2016) | 0.87 in (2008) |
| December 20 | 53.1°F (2018) | -4.0°F (2016) | 0.25 in (2012) |
| December 21 | 52.0°F (2015) | -2.0°F (2008) | 0.58 in (2012) |
| December 22 | 62.1°F (2015) | -2.0°F (2008) | 0.39 in (2013) |
| December 23 | 55.9°F (2007) | -9.0°F (2022) | 0.67 in (2001) |
| December 24 | 63.0°F (2020) | -7.1°F (2013) | 0.70 in (2009) |
| December 25 | 66.0°F (2021) | -7.1°F (2013) | 0.96 in (2009) |
| December 26 | 62.1°F (2019) | 1.9°F (2022) | 0.43 in (2016) |
| December 27 | 62.1°F (2019) | -9.9°F (2017) | 0.85 in (2015) |
| December 28 | 64.0°F (2008) | -9.9°F (2017) | 0.60 in (2008) |
| December 29 | 55.9°F (2003) | 1.0°F (2009) | 1.57 in (2015) |
| December 30 | 64.0°F (2022) | -2.9°F (2013) | 0.45 in (2020) |
| December 31 | 59.0°F (2004) | -4.0°F (2017) | 0.45 in (2010) |