Cook County Weather in December
Average highs run from 65°F on December 1 to 61°F on December 31, and lows from 44°F to 40°F. Normal precipitation for the month is 3.59 in over about 8 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
- 63°F
- Average low
- 42°F
- Precipitation
- 3.59 in
- Record high
- 85°FDec 5, 2013
- Record low
- 10°FDec 14, 1962
- Chance of a freeze
- 85%
- Daylight
- 10 h 16 min to 10 h 10 min
- Cloud cover
- 55%
- Humidity
- 81%
- Dew point
- 46°F
- Wind
- 7.6 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 65°F | 44°F | 82°F 1998 | 21°F 1959 | 21% |
| Dec 2 | 65°F | 44°F | 82°F 2012 | 22°F 1959 | 22% |
| Dec 3 | 65°F | 44°F | 84°F 1998 | 26°F 1988 | 22% |
| Dec 4 | 65°F | 44°F | 83°F 1982 | 22°F 1960 | 22% |
| Dec 5 | 64°F | 44°F | 85°F 2013 | 22°F 1960 | 22% |
| Dec 6 | 64°F | 44°F | 84°F 2013 | 27°F 1949 | 23% |
| Dec 7 | 64°F | 43°F | 84°F 1998 | 25°F 1962 | 23% |
| Dec 8 | 64°F | 43°F | 84°F 2022 | 23°F 2010 | 23% |
| Dec 9 | 64°F | 43°F | 85°F 2013 | 23°F 2010 | 24% |
| Dec 10 | 64°F | 43°F | 84°F 2019 | 25°F 1968 | 24% |
| Dec 11 | 63°F | 43°F | 83°F 1971 | 25°F 1977 | 24% |
| Dec 12 | 63°F | 43°F | 82°F 2007 | 25°F 1962 | 25% |
| Dec 13 | 63°F | 43°F | 85°F 1972 | 11°F 1962 | 25% |
| Dec 14 | 63°F | 42°F | 81°F 1948 | 10°F 1962 | 25% |
| Dec 15 | 63°F | 42°F | 82°F 1971 | 20°F 2010 | 25% |
| Dec 16 | 63°F | 42°F | 84°F 1971 | 23°F 1951 | 26% |
| Dec 17 | 62°F | 42°F | 82°F 1971 | 24°F 1968 | 26% |
| Dec 18 | 62°F | 42°F | 84°F 2021 | 23°F 1953 | 26% |
| Dec 19 | 62°F | 42°F | 80°F 1998 | 20°F 1981 | 26% |
| Dec 20 | 62°F | 41°F | 82°F 1998 | 15°F 1981 | 27% |
| Dec 21 | 62°F | 41°F | 85°F 2013 | 18°F 1981 | 27% |
| Dec 22 | 62°F | 41°F | 83°F 2013 | 23°F 1960 | 27% |
| Dec 23 | 62°F | 41°F | 80°F 1990 | 19°F 1989 | 27% |
| Dec 24 | 61°F | 41°F | 81°F 2015 | 14°F 1989 | 28% |
| Dec 25 | 61°F | 41°F | 82°F 2015 | 11°F 1983 | 28% |
| Dec 26 | 61°F | 41°F | 83°F 2015 | 13°F 1983 | 28% |
| Dec 27 | 61°F | 40°F | 84°F 2015 | 22°F 1961 | 28% |
| Dec 28 | 61°F | 40°F | 83°F 2015 | 22°F 2010 | 28% |
| Dec 29 | 61°F | 40°F | 80°F 1990 | 25°F 1961 | 28% |
| Dec 30 | 61°F | 40°F | 81°F 1996 | 18°F 1961 | 28% |
| Dec 31 | 61°F | 40°F | 80°F 1951 | 18°F 1961 | 29% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (EST).
- December 1
- sunrise 7:15 AM, sunset 5:31 PM
- December 31
- sunrise 7:32 AM, sunset 5:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00096087 (Moultrie 2 Ese), public domain. Records: NOAA GHCN-Daily, station USW00093845, 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.