December weather in Cave-In-Rock, IL
The average temperature in Cave-In-Rock in December is 35.8°F (26.3°F–45.2°F). Average precipitation: 4.44 inches. Average snowfall is 0.6 inches.
December is a winter month in Cave-In-Rock, and is cooler than the annual average of 54.8°F. Daily temperatures swing about 18.9°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 26m. For travel, December is cool.
Avg High
45.2°F
Avg Low
26.3°F
Precipitation
4.44 in
Snow
0.6 in
December records in Cave-In-Rock
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 69.1°F (1970) | 14.0°F (1985) | 1.97 in (2006) |
| December 2 | 75.9°F (1982) | 14.0°F (1988) | 0.76 in (1991) |
| December 3 | 73.0°F (1982) | 12.0°F (1985) | 4.96 in (1982) |
| December 4 | 71.1°F (2021) | 10.9°F (2006) | 0.90 in (1993) |
| December 5 | 73.0°F (2001) | 8.1°F (1987) | 3.80 in (2011) |
| December 6 | 72.0°F (2001) | 7.0°F (2002) | 1.66 in (2021) |
| December 7 | 72.0°F (1998) | 6.1°F (1977) | 2.17 in (1978) |
| December 8 | 64.9°F (1980) | 6.1°F (1977) | 2.22 in (1972) |
| December 9 | 64.9°F (1970) | 3.9°F (1995) | 1.04 in (1994) |
| December 10 | 71.1°F (1971) | 3.0°F (1995) | 1.61 in (2007) |
| December 11 | 69.1°F (2021) | 3.0°F (1995) | 1.00 in (1985) |
| December 12 | 71.1°F (1996) | 1.9°F (2013) | 1.05 in (1999) |
| December 13 | 70.0°F (2015) | 3.0°F (2013) | 0.90 in (2001) |
| December 14 | 70.0°F (2015) | 0.0°F (2010) | 1.26 in (1987) |
| December 15 | 71.1°F (1984) | 0.0°F (2010) | 1.62 in (1982) |
| December 16 | 70.0°F (1984) | -2.9°F (1989) | 1.60 in (2024) |
| December 17 | 66.0°F (1984) | 3.0°F (2000) | 3.98 in (2001) |
| December 18 | 69.1°F (2016) | 1.9°F (1989) | 1.81 in (1990) |
| December 19 | 64.0°F (1976) | 0.0°F (1985) | 1.83 in (2002) |
| December 20 | 63.0°F (1978) | -2.0°F (2000) | 0.74 in (1973) |
| December 21 | 62.1°F (2013) | -2.0°F (1989) | 4.05 in (1984) |
| December 22 | 62.1°F (1982) | -17.0°F (1989) | 4.61 in (2013) |
| December 23 | 62.1°F (1970) | -9.9°F (1989) | 2.24 in (2017) |
| December 24 | 68.0°F (1982) | -7.1°F (1989) | 1.84 in (1996) |
| December 25 | 68.0°F (1982) | -8.0°F (1983) | 1.71 in (1987) |
| December 26 | 72.0°F (2021) | 3.9°F (1983) | 1.26 in (1973) |
| December 27 | 70.0°F (1971) | 6.1°F (2017) | 2.64 in (2016) |
| December 28 | 72.0°F (2008) | 6.1°F (2017) | 2.18 in (2015) |
| December 29 | 72.0°F (1984) | 3.0°F (1983) | 1.82 in (2024) |
| December 30 | 66.9°F (1984) | -5.1°F (1983) | 1.16 in (1990) |
| December 31 | 64.9°F (1999) | -5.1°F (1976) | 1.50 in (1984) |