December weather in Ottawa, IL
The average temperature in Ottawa in December is 28.5°F (20.5°F–36.6°F). Average precipitation: 2.11 inches. Average snowfall is 5.3 inches.
December is a winter month in Ottawa, and is cooler than the annual average of 49.7°F. Daily temperatures swing about 16.1°F between overnight low and afternoon high. Expect about 11 days with precipitation. Daylight averages about 9h 1m. For travel, December is cold.
Avg High
36.6°F
Avg Low
20.5°F
Precipitation
2.11 in
Snow
5.3 in
December records in Ottawa
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 62.1°F (1998) | 7.0°F (1976) | 1.16 in (2006) |
| December 2 | 60.1°F (2012) | 5.0°F (1976) | 0.80 in (2018) |
| December 3 | 62.1°F (2012) | -0.9°F (1976) | 3.93 in (1982) |
| December 4 | 71.1°F (2012) | 1.9°F (2006) | 1.35 in (1973) |
| December 5 | 66.9°F (1998) | 0.0°F (2005) | 1.64 in (1999) |
| December 6 | 66.9°F (2001) | -0.9°F (2005) | 0.32 in (2004) |
| December 7 | 54.0°F (1998) | -5.1°F (2005) | 1.50 in (1994) |
| December 8 | 54.0°F (2023) | -7.1°F (2005) | 1.30 in (1980) |
| December 9 | 57.9°F (2024) | -0.9°F (2010) | 0.90 in (2009) |
| December 10 | 57.9°F (2024) | -5.1°F (2013) | 1.10 in (1971) |
| December 11 | 62.1°F (2021) | -2.0°F (1976) | 0.75 in (1971) |
| December 12 | 57.0°F (2015) | -7.1°F (2013) | 0.82 in (1972) |
| December 13 | 62.1°F (2015) | -13.0°F (2000) | 0.91 in (1946) |
| December 14 | 62.1°F (2015) | -2.9°F (2000) | 1.22 in (2015) |
| December 15 | 55.9°F (2021) | -6.0°F (2010) | 1.25 in (1971) |
| December 16 | 64.9°F (2021) | 0.0°F (2010) | 1.00 in (1992) |
| December 17 | 55.9°F (2015) | 0.0°F (2010) | 0.44 in (2008) |
| December 18 | 54.0°F (2002) | -2.9°F (2000) | 0.48 in (1949) |
| December 19 | 55.9°F (2002) | -13.0°F (2016) | 1.11 in (2008) |
| December 20 | 50.0°F (2011) | -9.0°F (2000) | 1.17 in (1987) |
| December 21 | 52.0°F (2012) | -9.9°F (2000) | 1.26 in (1949) |
| December 22 | 55.0°F (2015) | -7.1°F (2000) | 1.61 in (1949) |
| December 23 | 51.1°F (2006) | -13.0°F (2000) | 0.83 in (1961) |
| December 24 | 59.0°F (2020) | -6.0°F (2022) | 0.77 in (2009) |
| December 25 | 57.9°F (2021) | -15.0°F (2000) | 2.06 in (1965) |
| December 26 | 60.1°F (2019) | -16.1°F (2000) | 0.96 in (1949) |
| December 27 | 60.1°F (2019) | -9.9°F (2017) | 1.38 in (1942) |
| December 28 | 57.9°F (2008) | -11.0°F (2017) | 1.10 in (2008) |
| December 29 | 63.0°F (2019) | -5.1°F (1976) | 1.60 in (2015) |
| December 30 | 61.0°F (2022) | -5.1°F (1976) | 1.41 in (1971) |
| December 31 | 61.0°F (2002) | -13.0°F (1976) | 0.50 in (1992) |