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United States weather

Weather in Cook County, Illinois for December 2025

Your guide to Cook County weather in December - trends and predictions

    Snow Forecast ❄️

  • Cook County typically experiences moderate snowfall in December, with an average of 6 snowy days.
    According to Cook County snow forecast for December 2025, 7 snowy days are expected until the end of the month. The closest date with snow is Thursday, December 18.

    • Temperatures

  • Until now, December 2025 in Cook County is cooler than usual, with temperatures averaging -0.5 °F, this is -4.6 °F below the typical seasonal average.

  • The forecast for the next days in Cook County predicts a temperature of -0.3 °F, which is cooler than the historical average.

  • In general, the average temperature in Cook County at the beginning of December is 3.9 °F. As the month progressed, temperatures tended to significantly cool down, reaching an average of 0 °F by the end of December.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
11
Dry days
Average rainy days
14
Rainy days
Average snowy days
6
Snow days
Average temperatures
4°/0°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
73 %
Avg humidity

Cook County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Overcast
4°
2
Patchy rain possible
5°
3
Partly cloudy
5°
4
Overcast
2°
5
Overcast
3°
6
Overcast
3°
7
Overcast
5°
8
Overcast
4°
9
Overcast
6°
10
Overcast
6°
11
Overcast
4°
12
Partly cloudy
3°
13
Cloudy
3°
14
Partly cloudy
4°
15
Sunny
-4°
16
Overcast
4°
17
Overcast
-1°
18
Moderate rain
9°
19
Overcast
-6°
20
Moderate or heavy snow showers
3°
21
Light freezing rain
-3°
22
Sunny
1°
23
Partly cloudy
5°
24
Sunny
1°
25
Light freezing rain
-1°
26
Blowing snow
-2°
27
Partly cloudy
-8°
28
Light freezing rain
-2°
29
Overcast
5°
30
Overcast
5°
31
Overcast
3°

Temperatures trend during December in Cook County

See the weather trend as well as the moving average line

December weather in Cook County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Overcast
Overcast
 4° /-2° 5.3 mm 1.6 cm
Dec. 2 Patchy rain possible
Patchy rain possible
 5° /0° 1 mm 0.2 cm
Dec. 3 Partly cloudy
Partly cloudy
 5° /-1° 4.8 mm 0.8 cm
Dec. 4 Overcast
Overcast
 2° /-3° 0 mm 0 cm
Dec. 5 Overcast
Overcast
 3° /-4° 3.7 mm 0.3 cm
Dec. 6 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 7 Overcast
Overcast
 5° /-1° 1.4 mm 1 cm
Dec. 8 Overcast
Overcast
 4° /0° 0.1 mm 0 cm
Dec. 9 Overcast
Overcast
 6° /1° 3 mm 0 cm
Dec. 10 Overcast
Overcast
 6° /1° 4.2 mm 0 cm
Dec. 11 Overcast
Overcast
 4° /-1° 2.5 mm 0 cm
Dec. 12 Partly cloudy
Partly cloudy
 3° /-2° 8 mm 0.7 cm
Dec. 13 Cloudy
Cloudy
 3° /-3° 1.5 mm 1 cm
Dec. 14 Partly cloudy
Partly cloudy
 4° /-2° 5.7 mm 0 cm
Dec. 15 Sunny
Sunny
 -4° /-17° 0 mm 0 cm
Dec. 16 Overcast
Overcast
 4° /-8° 0 mm 0 cm
Dec. 17 Overcast
Overcast
 -1° /-2° 0 mm 0 cm
Dec. 18 Moderate rain
Moderate rain
 9° /-5° 12.6 mm 0.8 cm
Dec. 19 Overcast
Overcast
 -6° /-10° 0 mm 0 cm
Dec. 20 Moderate or heavy snow showers
Moderate or heavy snow showers
 3° /-3° 1.6 mm 1.2 cm
Dec. 21 Light freezing rain
Light freezing rain
 -3° /-8° 0.2 mm 0.1 cm
Dec. 22 Sunny
Sunny
 1° /-8° 0 mm 0 cm
Dec. 23 Partly cloudy
Partly cloudy
 5° /2° 0 mm 0 cm
Dec. 24 Sunny
Sunny
 1° /-4° 0 mm 0 cm
Dec. 25 Light freezing rain
Light freezing rain
 -1° /-6° 0.2 mm 0.1 cm
Dec. 26 Blowing snow
Blowing snow
 -2° /-9° 0.5 mm 0.3 cm
Dec. 27 Partly cloudy
Partly cloudy
 -8° /-11° 0 mm 0 cm
Dec. 28 Light freezing rain
Light freezing rain
 -2° /-8° 0.2 mm 0.1 cm
Dec. 29 Overcast
Overcast
 5° /1° 2.6 mm 1.2 cm
Dec. 30 Overcast
Overcast
 5° /0° 2.8 mm 1.2 cm
Dec. 31 Overcast
Overcast
 3° /-2° 9.9 mm 3.9 cm
Next
Important Notice
Our weather forecast for Cook County in December 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.
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Cook County in December - FAQ

What are the expected maximum and minimum temperatures in Cook County during December?
Brace for cold days with temperatures not exceeding 4° 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 December?
Moderate rainfall is anticipated in Cook County during December, with a total of 80.2 mm spread over approximately 14 days. Considering plans for rainy days is advisable.
Will it snow in Cook County in December 2025?
Cook County experiences an average snowfall of 7.601 cm during December, occurring over 6 days.
What are the typical wind conditions in Cook County during December?
The average wind speed in Cook County during December is 24 km/h, suggesting breezy to windy conditions, depending on your activities.

Cook County snow forecast December 2025

Track daily snowfall levels and discover Cook County’s snowy potential this December ❄️
On average, Cook County sees 6 snowy days during December, with approximately 7.6 cm of total snowfall.

December rainfall patterns in Cook County

Explore the daily rainfall trends and prepare for Cook Countys December weather 💧
Typically, Cook County has 14 rainy days in December with a total of 80.2 mm of rainfall.
Top locations in Cook County
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Location coordinates 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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