Winnebago County (Rockford)
December
Weather in Winnebago County, Illinois for December 2026
Your guide to Winnebago County weather in December - trends and predictions
With an average of 5 snowy days, Winnebago County usually enjoys a light touch of snow in December.
In general, the average temperature in Winnebago County at the beginning of December is 0.3 °C. As the month progressed, temperatures tended to noticeably warm up, reaching an average of 3.1 °C by the end of December.
Is December a good time to visit Winnebago County? check out the best time to travel to Winnebago County page.
✨ Is December a good time to visit Winnebago County? – Ask the AI Weatherman
Snow Forecast ❄️
Temperatures
More
22
Dry days
4
Rainy days
5
Snow days
1°/-4°
Temperatures
22 km/h
Avg max wind
81 %
Avg humidity
Winnebago County Weather December
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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
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Light snow | 0° /-8° | 7.1 mm | 4.5 cm | |
| Dec. 2 | Light snow | -1° /-5° | 1.2 mm | 0.7 cm | |
| Dec. 3 | Light snow | 1° /-5° | 7.6 mm | 4.4 cm | |
| Dec. 4 |  Mist | -2° /-8° | 0 mm | 0 cm | |
| Dec. 5 | Light snow | -1° /-8° | 1 mm | 0.7 cm | |
| Dec. 6 |  Overcast | 0° /-5° | 0 mm | 0 cm | |
| Dec. 7 | Light snow | 5° /-5° | 6.4 mm | 4.2 cm | |
| Dec. 8 | Overcast | 3° /-3° | 0.1 mm | 0 cm | |
| Dec. 9 |  Light rain | 5° /-2° | 5.1 mm | 0 cm | |
| Dec. 10 | Light snow | 1° /-2° | 2.3 mm | 0 cm | |
| Dec. 11 |  Sunny | -1° /-7° | 0 mm | 0 cm | |
| Dec. 12 | Light snow | -3° /-7° | 2 mm | 1.4 cm | |
| Dec. 13 | Light snow | -2° /-10° | 1.6 mm | 1.1 cm | |
| Dec. 14 | Light snow | 0° /-8° | 3.7 mm | 0.4 cm | |
| Dec. 15 | Light rain | 1° /-5° | 4.8 mm | 0 cm | |
| Dec. 16 | Light rain | 2° /-1° | 4 mm | 0 cm | |
| Dec. 17 | Fog | 3° /0° | 0 mm | 0 cm | |
| Dec. 18 | Light snow | 1° /-3° | 2.4 mm | 1 cm | |
| Dec. 19 | Overcast | -2° /-7° | 0 mm | 0 cm | |
| Dec. 20 | Overcast | 2° /-4° | 0 mm | 0 cm | |
| Dec. 21 |  Patchy rain possible | -1° /-5° | 0.5 mm | 0 cm | |
| Dec. 22 | Light rain | 2° /-2° | 3.6 mm | 0 cm | |
| Dec. 23 | Fog | 4° /1° | 0.3 mm | 0 cm | |
| Dec. 24 |  Cloudy | 5° /1° | 0 mm | 0 cm | |
| Dec. 25 | Light rain | 4° /3° | 2.6 mm | 0 cm | |
| Dec. 26 | Fog | 4° /0° | 0.2 mm | 0 cm | |
| Dec. 27 | Light rain | 4° /1° | 3.5 mm | 0 cm | |
| Dec. 28 |  Moderate rain | 6° /3° | 14.8 mm | 0 cm | |
| Dec. 29 | Patchy rain possible | 1° /-3° | 0.3 mm | 0 cm | |
| Dec. 30 | Overcast | 2° /-3° | 0 mm | 0 cm | |
| Dec. 31 |  Moderate or heavy snow showers | 0° /-3° | 7.5 mm | 5.4 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 1° 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 82.6 mm spread over approximately 4 days. Considering plans for rainy days is advisable.
Will it snow in Winnebago County in December 2026?
Winnebago County experiences an average snowfall of 23.8 cm during December, occurring over 5 days.
What are the typical wind conditions in Winnebago County during December?
The average wind speed in Winnebago County during December is 22 km/h, suggesting breezy to windy conditions, depending on your activities.
Winnebago County snow forecast December 2026
Track daily snowfall levels and discover Winnebago County’s snowy potential this December ❄️
On average, Winnebago County sees 5 snowy days during December, with approximately 23.8 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 4 rainy days in December with a total of 82.6 mm of rainfall.
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