December weather in Rock Island, IL
The average temperature in Rock Island in December is 28.9°F (20.8°F–37.0°F). Average precipitation: 2.04 inches. Average snowfall is 8.8 inches.
December is a winter month in Rock Island, and is cooler than the annual average of 51.2°F. Daily temperatures swing about 16.2°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 9h 1m. For travel, December is cold.
Avg High
37.0°F
Avg Low
20.8°F
Precipitation
2.04 in
Snow
8.8 in
December records in Rock Island
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1962) | 8.1°F (1960) | 1.52 in (1985) |
| December 2 | 64.9°F (1973) | -0.9°F (1976) | 3.11 in (1982) |
| December 3 | 69.1°F (1970) | -0.9°F (1985) | 0.87 in (1990) |
| December 4 | 71.1°F (1998) | -4.0°F (2025) | 1.40 in (1973) |
| December 5 | 69.1°F (2001) | -4.0°F (2005) | 0.54 in (1999) |
| December 6 | 63.0°F (1951) | -5.1°F (1977) | 1.01 in (1998) |
| December 7 | 60.1°F (1946) | -11.9°F (1976) | 1.15 in (1980) |
| December 8 | 66.9°F (1991) | -7.1°F (1958) | 0.80 in (2009) |
| December 9 | 60.1°F (1946) | -11.9°F (1958) | 1.08 in (2003) |
| December 10 | 62.1°F (2020) | -16.1°F (1972) | 1.50 in (1970) |
| December 11 | 66.9°F (1949) | -18.0°F (1972) | 0.95 in (2007) |
| December 12 | 64.9°F (1991) | -11.0°F (2000) | 1.07 in (1946) |
| December 13 | 64.9°F (2015) | -11.9°F (2000) | 1.23 in (2015) |
| December 14 | 62.1°F (2015) | -9.0°F (1985) | 1.01 in (2011) |
| December 15 | 75.0°F (2021) | -16.1°F (1989) | 1.88 in (1992) |
| December 16 | 63.0°F (2021) | -13.0°F (1951) | 0.30 in (2008) |
| December 17 | 52.0°F (1977) | -8.0°F (1945) | 0.39 in (1967) |
| December 18 | 59.0°F (1962) | -16.1°F (1985) | 1.17 in (1957) |
| December 19 | 57.0°F (1988) | -18.0°F (1985) | 1.39 in (1987) |
| December 20 | 57.9°F (1967) | -14.1°F (1963) | 1.48 in (2012) |
| December 21 | 59.0°F (1967) | -22.0°F (1963) | 0.68 in (2006) |
| December 22 | 57.0°F (1957) | -20.9°F (1963) | 1.23 in (1979) |
| December 23 | 63.0°F (2020) | -24.0°F (1989) | 0.66 in (2009) |
| December 24 | 64.0°F (2021) | -18.9°F (1983) | 1.90 in (1965) |
| December 25 | 62.1°F (2019) | -18.0°F (2000) | 0.72 in (1957) |
| December 26 | 55.9°F (2016) | -18.9°F (1962) | 0.65 in (1954) |
| December 27 | 62.1°F (1946) | -13.0°F (1951) | 1.33 in (2008) |
| December 28 | 66.9°F (1984) | -9.9°F (1961) | 1.28 in (2019) |
| December 29 | 66.9°F (2022) | -6.0°F (1983) | 1.34 in (2020) |
| December 30 | 61.0°F (1965) | -7.1°F (1963) | 0.94 in (1992) |
| December 31 | 61.0°F (1965) | -17.0°F (1967) | 0.90 in (2018) |