Rock Island Weather in December
Average highs run from 37°F on December 1 to 32°F on December 31, and lows from 27°F to 23°F. Normal precipitation for the month is 1.31 in over about 11 wet days.
December day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
December at a glance
- Average high
- 33°F
- Average low
- 25°F
- Precipitation
- 1.31 in
- Snowfall
- 6.0 in
- Record high
- 70°FDec 1, 2021
- Record low
- -21°FDec 30, 1968
- Chance of a freeze
- 100%
- Daylight
- 8 h 45 min to 8 h 32 min
- Cloud cover
- 73%
- Humidity
- 90%
- Dew point
- 22°F
- Wind
- 5.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Dec 1 | 37°F | 27°F | 70°F 2021 | -4°F 1985 | 31% | 10% |
| Dec 2 | 37°F | 27°F | 58°F 1975 | 8°F 1985 | 31% | 11% |
| Dec 3 | 36°F | 27°F | 57°F 1975 | 6°F 1984 | 31% | 11% |
| Dec 4 | 36°F | 27°F | 55°F 1975 | 5°F 1984 | 32% | 12% |
| Dec 5 | 36°F | 26°F | 49°F 2025 | 8°F 1984 | 32% | 12% |
| Dec 6 | 35°F | 26°F | 54°F 1979 | 5°F 1980 | 32% | 12% |
| Dec 7 | 35°F | 26°F | 51°F 1973 | 3°F 1972 | 33% | 13% |
| Dec 8 | 35°F | 26°F | 52°F 1991 | -1°F 1972 | 33% | 13% |
| Dec 9 | 35°F | 25°F | 52°F 2015 | 3°F 1972 | 33% | 14% |
| Dec 10 | 34°F | 25°F | 68°F 2025 | 2°F 2009 | 33% | 14% |
| Dec 11 | 34°F | 25°F | 62°F 2025 | 4°F 1972 | 34% | 15% |
| Dec 12 | 34°F | 25°F | 51°F 2025 | 6°F 1972 | 34% | 15% |
| Dec 13 | 34°F | 25°F | 53°F 1979 | 4°F 1972 | 34% | 15% |
| Dec 14 | 33°F | 25°F | 58°F 1979 | 6°F 1972 | 34% | 16% |
| Dec 15 | 33°F | 24°F | 59°F 2025 | -3°F 1964 | 34% | 16% |
| Dec 16 | 33°F | 24°F | 58°F 1999 | -11°F 1964 | 34% | 16% |
| Dec 17 | 33°F | 24°F | 52°F 1998 | -12°F 1964 | 34% | 17% |
| Dec 18 | 33°F | 24°F | 52°F 1976 | -3°F 1964 | 34% | 17% |
| Dec 19 | 32°F | 24°F | 49°F 2004 | -4°F 1984 | 34% | 17% |
| Dec 20 | 32°F | 24°F | 51°F 2020 | -7°F 2008 | 34% | 17% |
| Dec 21 | 32°F | 24°F | 55°F 1974 | -7°F 2022 | 34% | 17% |
| Dec 22 | 32°F | 23°F | 51°F 2014 | -9°F 1983 | 34% | 18% |
| Dec 23 | 32°F | 23°F | 46°F 2013 | -15°F 1983 | 34% | 18% |
| Dec 24 | 32°F | 23°F | 48°F 2014 | -1°F 1983 | 34% | 18% |
| Dec 25 | 32°F | 23°F | 50°F 1963 | 4°F 1983 | 34% | 18% |
| Dec 26 | 32°F | 23°F | 56°F 1980 | 5°F 1990 | 34% | 18% |
| Dec 27 | 32°F | 23°F | 57°F 1980 | 1°F 1996 | 34% | 18% |
| Dec 28 | 32°F | 23°F | 52°F 2011 | -16°F 1968 | 34% | 18% |
| Dec 29 | 32°F | 23°F | 53°F 1997 | -20°F 1968 | 34% | 18% |
| Dec 30 | 32°F | 23°F | 48°F 2011 | -21°F 1968 | 34% | 18% |
| Dec 31 | 32°F | 23°F | 49°F 1998 | -13°F 1968 | 34% | 18% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PST).
- December 1
- sunrise 7:27 AM, sunset 4:12 PM
- December 31
- sunrise 7:48 AM, sunset 4:20 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00094239 (Wenatchee Pangborn AP), public domain. Records: NOAA GHCN-Daily, station USW00094239, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.