Cook County (Chicago)
January
Weather in Cook County for January 2026
Your guide to Cook County weather in January - trends and predictions
Expect heavy snowfall in Cook County during January, with an average of 17 snowy days.
In general, the average temperature in Cook County at the beginning of January is 1.3 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of -0.1 °F by the end of January.
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Snow Forecast ❄️
Temperatures
More
10
Dry days
4
Rainy days
17
Snow days
0°/-4°
Temperatures
22 km/h
Avg max wind
80 %
Avg humidity
Cook County Weather January
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  3° | 2 2° | 3  2° | ||||
| 4 2° | 5 1° | 6 -0° | 7 -1° | 8 0° | 9 2° | 10 -0° |
| 11 2° | 12 2° | 13 1° | 14  -2° | 15 -2° | 16  -1° | 17 0° |
| 18 -0° | 19 -2° | 20  -5° | 21  -3° | 22 -1° | 23 -2° | 24 -0° |
| 25 -1° | 26 -2° | 27 1° | 28 -1° | 29 1° | 30 -0° | 31 1° |
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Temperatures trend during January in Cook County
See the weather trend as well as the moving average line
January weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Jan. 1 | Overcast | 3° /-1° | 6.8 mm | 3.9 cm | |
| Jan. 2 | Overcast | 2° /-2° | 0.6 mm | 0.1 cm | |
| Jan. 3 | Light freezing rain | 2° /-3° | 4 mm | 0.5 cm | |
| Jan. 4 | Overcast | 2° /-3° | 0 mm | 0 cm | |
| Jan. 5 | Overcast | 1° /-4° | 0.3 mm | 0 cm | |
| Jan. 6 | Overcast | 0° /-3° | 1.1 mm | 0.6 cm | |
| Jan. 7 | Light freezing rain | -1° /-4° | 0.2 mm | 0.1 cm | |
| Jan. 8 | Overcast | 0° /-4° | 0.9 mm | 0.1 cm | |
| Jan. 9 | Overcast | 2° /-5° | 4.1 mm | 1.6 cm | |
| Jan. 10 | Overcast | 0° /-4° | 0.3 mm | 0 cm | |
| Jan. 11 | Overcast | 2° /-5° | 0.3 mm | 0.3 cm | |
| Jan. 12 | Overcast | 2° /-1° | 5.7 mm | 2.1 cm | |
| Jan. 13 | Overcast | 1° /-5° | 1.1 mm | 0 cm | |
| Jan. 14 | Patchy rain possible | -2° /-7° | 1.4 mm | 0 cm | |
| Jan. 15 | Overcast | -2° /-8° | 0.3 mm | 0 cm | |
| Jan. 16 | Patchy moderate snow | -1° /-7° | 1.7 mm | 0.1 cm | |
| Jan. 17 | Light freezing rain | 0° /-5° | 0.4 mm | 0 cm | |
| Jan. 18 | Overcast | 0° /-5° | 1.1 mm | 0.2 cm | |
| Jan. 19 | Overcast | -2° /-9° | 2.7 mm | 0.6 cm | |
| Jan. 20 | Partly cloudy | -5° /-11° | 0 mm | 0 cm | |
| Jan. 21 | Sunny | -3° /-10° | 0 mm | 0 cm | |
| Jan. 22 | Overcast | -1° /-7° | 1.3 mm | 0.1 cm | |
| Jan. 23 | Overcast | -2° /-7° | 4.1 mm | 0.7 cm | |
| Jan. 24 | Patchy moderate snow | 0° /-6° | 2.9 mm | 0.6 cm | |
| Jan. 25 | Patchy moderate snow | -1° /-5° | 4.7 mm | 0.9 cm | |
| Jan. 26 | Partly cloudy | -2° /-6° | 3.8 mm | 1.4 cm | |
| Jan. 27 | Overcast | 1° /-6° | 0.4 mm | 0 cm | |
| Jan. 28 | Partly cloudy | -1° /-6° | 2.2 mm | 0.5 cm | |
| Jan. 29 | Overcast | 1° /-6° | 0.4 mm | 0.1 cm | |
| Jan. 30 | Overcast | 0° /-5° | 2.7 mm | 1.6 cm | |
| Jan. 31 | Overcast | 1° /-5° | 4.1 mm | 1.3 cm | |
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Important Notice
Our weather forecast for Cook County in January is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Cook County forecast closer to your planned date for the most up-to-date weather information.
Cook County in January - FAQ
What are the expected maximum and minimum temperatures in Cook County during January?
Brace for cold days with temperatures not exceeding 0° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Cook County during January?
Moderate rainfall is anticipated in Cook County during January, with a total of 72.3 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
Will it snow in Cook County in January 2026?
Cook County experiences an average snowfall of 21.4475 cm during January, occurring over 17 days.
What are the typical wind conditions in Cook County during January?
The average wind speed in Cook County during January is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
Cook County snow forecast January 2026
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January rainfall patterns in Cook County
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Where is Cook County?Get accurate weather forecasts for Cook County, located at latitude 41.85 and longitude -87.65. Stay updated with localized weather information tailored for Cook County.
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