Cook County Weather in January
Average highs run from 23°F on January 1 to 22°F on January 31, and lows from 8°F to 5°F. Normal precipitation for the month is 0.99 in over about 7 wet days.
January day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
January at a glance
- Average high
- 21°F
- Average low
- 6°F
- Precipitation
- 0.99 in
- Snowfall
- 15.6 in
- Record high
- 49°FJan 8, 2003
- Record low
- -27°FJan 17, 2005
- Chance of a freeze
- 100%
- Daylight
- 8 h 30 min to 9 h 31 min
- Cloud cover
- 66%
- Humidity
- 98%
- Dew point
- 6°F
- Wind
- 8.7 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 |
|---|---|---|---|---|---|---|
| Jan 1 | 23°F | 8°F | 36°F 2007 | -21°F 2014 | 24% | 20% |
| Jan 2 | 22°F | 8°F | 37°F 2007 | -12°F 2010 | 24% | 20% |
| Jan 3 | 22°F | 7°F | 40°F 2007 | -11°F 2014 | 24% | 20% |
| Jan 4 | 22°F | 7°F | 42°F 2007 | -19°F 2018 | 24% | 21% |
| Jan 5 | 22°F | 7°F | 42°F 2007 | -26°F 2014 | 24% | 21% |
| Jan 6 | 22°F | 7°F | 44°F 2012 | -22°F 2014 | 24% | 21% |
| Jan 7 | 22°F | 7°F | 48°F 2003 | -15°F 2014 | 24% | 21% |
| Jan 8 | 22°F | 6°F | 49°F 2003 | -15°F 2014 | 24% | 21% |
| Jan 9 | 22°F | 6°F | 43°F 2002 | -18°F 1999 | 24% | 21% |
| Jan 10 | 21°F | 6°F | 42°F 2012 | -15°F 1999 | 24% | 21% |
| Jan 11 | 21°F | 6°F | 41°F 2013 | -17°F 1999 | 24% | 21% |
| Jan 12 | 21°F | 6°F | 43°F 2013 | -21°F 1999 | 24% | 21% |
| Jan 13 | 21°F | 6°F | 41°F 2026 | -15°F 1999 | 23% | 21% |
| Jan 14 | 21°F | 6°F | 37°F 2021 | -12°F 2005 | 23% | 21% |
| Jan 15 | 21°F | 5°F | 38°F 2021 | -18°F 2005 | 23% | 21% |
| Jan 16 | 21°F | 5°F | 37°F 2023 | -24°F 2005 | 23% | 21% |
| Jan 17 | 21°F | 5°F | 41°F 2010 | -27°F 2005 | 23% | 21% |
| Jan 18 | 21°F | 5°F | 38°F 2017 | -10°F 2024 | 23% | 21% |
| Jan 19 | 21°F | 5°F | 41°F 2018 | -18°F 2008 | 23% | 21% |
| Jan 20 | 21°F | 5°F | 40°F 2018 | -18°F 2025 | 22% | 21% |
| Jan 21 | 21°F | 5°F | 39°F 2017 | -22°F 2014 | 22% | 21% |
| Jan 22 | 21°F | 5°F | 40°F 2017 | -22°F 2013 | 22% | 20% |
| Jan 23 | 21°F | 5°F | 42°F 2015 | -24°F 2026 | 22% | 20% |
| Jan 24 | 21°F | 5°F | 41°F 2017 | -17°F 2026 | 21% | 20% |
| Jan 25 | 21°F | 5°F | 37°F 2010 | -19°F 2019 | 21% | 20% |
| Jan 26 | 21°F | 5°F | 41°F 2018 | -19°F 2019 | 21% | 20% |
| Jan 27 | 21°F | 5°F | 44°F 2006 | -27°F 2019 | 21% | 20% |
| Jan 28 | 21°F | 5°F | 39°F 2025 | -16°F 2014 | 21% | 20% |
| Jan 29 | 21°F | 5°F | 40°F 2013 | -16°F 2004 | 21% | 19% |
| Jan 30 | 22°F | 5°F | 44°F 2016 | -19°F 2019 | 20% | 19% |
| Jan 31 | 22°F | 5°F | 42°F 2016 | -26°F 2019 | 20% | 19% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CST).
- January 1
- sunrise 7:51 AM, sunset 4:21 PM
- January 31
- sunrise 7:30 AM, sunset 5:01 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00213282 (Grand Marais), public domain. Records: NOAA GHCN-Daily, station USW00094992, 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.