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Weather in Winnebago County, Illinois for December 2025

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

    Snow Forecast ❄️

  • Winnebago County typically experiences moderate snowfall in December, with an average of 7 snowy days.
    According to Winnebago County snow forecast for December 2025, 1 snowy day is expected in the next 2 weeks at Tuesday, December 23.

    • Temperatures

  • Until now, December 2025 in Winnebago County is cooler than usual, with temperatures averaging -1.8 °F, this is -3.1 °F below the typical seasonal average.

  • Expect cooler weather in the next days in Winnebago County with the forecast suggesting a temperature of -0.6 °F, lower than the historical average.

  • In general, the average temperature in Winnebago County at the beginning of December is 0.7 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 4.3 °F by the end of December.

    • More

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Average dry days
17
Dry days
Average rainy days
7
Rainy days
Average snowy days
7
Snow days
Average temperatures
3°/-2°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
78 %
Avg humidity

Winnebago County Weather December

Move between months or click on a day
November
January
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Heavy snow
0°
2
Fog
-0°
3
Light snow
1°
4
Mist
-1°
5
Heavy snow
-1°
6
Overcast
1°
7
Overcast
5°
8
Overcast
3°
9
Overcast
6°
10
Overcast
1°
11
Sunny
-1°
12
Cloudy
-4°
13
Overcast
-11°
14
Sunny
-11°
15
Sunny
-2°
16
Mist
0°
17
Fog
1°
18
Partly cloudy
4°
19
Light freezing rain
3°
20
Patchy rain possible
4°
21
Overcast
3°
22
Patchy rain possible
2°
23
Light snow
-0°
24
Sunny
-4°
25
Overcast
3°
26
Patchy rain possible
6°
27
Overcast
5°
28
Light drizzle
6°
29
Patchy rain possible
5°
30
Overcast
4°
31
Moderate or heavy snow showers
1°

Temperatures trend during December in Winnebago County

See the weather trend as well as the moving average line

December weather in Winnebago County day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Heavy snow
Heavy snow
 0° /-8° 7.1 mm 4.5 cm
Dec. 2 Fog
Fog
 0° /-5° 1.2 mm 0.7 cm
Dec. 3 Light snow
Light snow
 1° /-5° 7.6 mm 4.4 cm
Dec. 4 Mist
Mist
 -1° /-8° 0 mm 0 cm
Dec. 5 Heavy snow
Heavy snow
 -1° /-8° 1 mm 0.7 cm
Dec. 6 Overcast
Overcast
 1° /-6° 0 mm 0 cm
Dec. 7 Overcast
Overcast
 5° /-6° 6.4 mm 4.2 cm
Dec. 8 Overcast
Overcast
 3° /-3° 0.1 mm 0 cm
Dec. 9 Overcast
Overcast
 6° /-2° 5.1 mm 0 cm
Dec. 10 Overcast
Overcast
 1° /-3° 2.3 mm 0 cm
Dec. 11 Sunny
Sunny
 -1° /-8° 0 mm 0 cm
Dec. 12 Cloudy
Cloudy
 -4° /-8° 0 mm 0 cm
Dec. 13 Overcast
Overcast
 -11° /-20° 0 mm 0 cm
Dec. 14 Sunny
Sunny
 -11° /-18° 0 mm 0 cm
Dec. 15 Sunny
Sunny
 -2° /-16° 0 mm 0 cm
Dec. 16 Mist
Mist
 0° /-12° 0 mm 0 cm
Dec. 17 Fog
Fog
 1° /0° 0 mm 0 cm
Dec. 18 Partly cloudy
Partly cloudy
 4° /1° 0 mm 0 cm
Dec. 19 Light freezing rain
Light freezing rain
 3° /-6° 0.3 mm 0 cm
Dec. 20 Patchy rain possible
Patchy rain possible
 4° /2° 1.6 mm 0 cm
Dec. 21 Overcast
Overcast
 3° /0° 0 mm 0 cm
Dec. 22 Patchy rain possible
Patchy rain possible
 2° /0° 2.4 mm 0 cm
Dec. 23 Light snow
Light snow
 0° /-9° 0 mm 0 cm
Dec. 24 Sunny
Sunny
 -4° /-11° 0 mm 0 cm
Dec. 25 Overcast
Overcast
 3° /-3° 0 mm 0 cm
Dec. 26 Patchy rain possible
Patchy rain possible
 6° /0° 0.2 mm 0 cm
Dec. 27 Overcast
Overcast
 5° /1° 5.3 mm 0 cm
Dec. 28 Light drizzle
Light drizzle
 6° /2° 2.5 mm 0 cm
Dec. 29 Patchy rain possible
Patchy rain possible
 5° /1° 0.5 mm 0 cm
Dec. 30 Overcast
Overcast
 4° /0° 0 mm 0 cm
Dec. 31 Moderate or heavy snow showers
Moderate or heavy snow showers
 1° /-2° 11.2 mm 8.1 cm
Next
Important Notice
Our weather forecast for Winnebago 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 Winnebago County forecast closer to your planned date for the most up-to-date weather information.
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Winnebago County in December - FAQ

What are the expected maximum and minimum temperatures in Winnebago County during December?
Brace for cold days with temperatures not exceeding 3° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Winnebago County during December?
Moderate rainfall is anticipated in Winnebago County during December, with a total of 70.1 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
Will it snow in Winnebago County in December 2025?
Winnebago County experiences an average snowfall of 15.265 cm during December, occurring over 7 days.
What are the typical wind conditions in Winnebago County during December?
The average wind speed in Winnebago County during December is 21 km/h, suggesting breezy to windy conditions, depending on your activities.

Winnebago County snow forecast December 2025

Track daily snowfall levels and discover Winnebago County’s snowy potential this December ❄️
On average, Winnebago County sees 7 snowy days during December, with approximately 15.3 cm of total snowfall.

December rainfall patterns in Winnebago County

Explore the daily rainfall trends and prepare for Winnebago Countys December weather 💧
Typically, Winnebago County has 7 rainy days in December with a total of 70.1 mm of rainfall.
Top locations in Winnebago County
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Rockford
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Location coordinates Where is Winnebago County?

Get accurate weather forecasts for Winnebago County, located at latitude 42.271 and longitude -89.094. Stay updated with localized weather information tailored for Winnebago County.

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