Williamson County (Energy)
December
Weather in Williamson County, Illinois for December 2025
Your guide to Williamson County weather in December - trends and predictions
With an average of 2 snowy days, Williamson County usually enjoys a light touch of snow in December.
In general, the average temperature in Williamson County at the beginning of December is 2.3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 9 °F by the end of December.
Williamson County experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 164.9 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Snow Forecast ❄️
Temperatures
Rain 🌧️
More
22
Dry days
7
Rainy days
2
Snow days
7°/1°
Temperatures
21 km/h
Avg max wind
71 %
Avg humidity
Williamson County Weather December
Move between months or click on a day
Temperatures trend during December in Williamson County
See the weather trend as well as the moving average line
December weather in Williamson County day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Cloudy | 0° /-4° | 0 mm | 0 cm | |
| Dec. 2 |  Overcast | 0° /-2° | 0 mm | 0 cm | |
| Dec. 3 |  Partly cloudy | 2° /-6° | 0 mm | 0 cm | |
| Dec. 4 | Overcast | 4° /-3° | 0 mm | 0 cm | |
| Dec. 5 |  Sunny | 1° /-7° | 0 mm | 0 cm | |
| Dec. 6 | Partly cloudy | 1° /-5° | 0 mm | 0 cm | |
| Dec. 7 | Sunny | 8° /-3° | 0 mm | 0 cm | |
| Dec. 8 | Overcast | 7° /1° | 0 mm | 0 cm | |
| Dec. 9 |  Light rain shower | 13° /7° | 7.2 mm | 0 cm | |
| Dec. 10 | Overcast | 7° /0° | 0 mm | 0 cm | |
| Dec. 11 | Partly cloudy | 6° /-1° | 0 mm | 0 cm | |
| Dec. 12 | Sunny | 9° /-2° | 0 mm | 0 cm | |
| Dec. 13 | Overcast | 9° /1° | 0 mm | 0 cm | |
| Dec. 14 | Sunny | 10° /1° | 40.5 mm | 0 cm | |
| Dec. 15 | Overcast | 12° /5° | 0 mm | 0 cm | |
| Dec. 16 |  Light rain | 13° /7° | 30.7 mm | 0 cm | |
| Dec. 17 | Patchy rain possible | 11° /4° | 0.2 mm | 0 cm | |
| Dec. 18 | Sunny | 7° /0° | 11.6 mm | 0 cm | |
| Dec. 19 | Overcast | 4° /-3° | 0 mm | 0 cm | |
| Dec. 20 | Cloudy | 5° /-1° | 0 mm | 0 cm | |
| Dec. 21 | Overcast | 8° /0° | 0 mm | 0 cm | |
| Dec. 22 | Patchy rain possible | 8° /1° | 0.1 mm | 0 cm | |
| Dec. 23 | Light rain shower | 11° /5° | 0.5 mm | 0 cm | |
| Dec. 24 | Overcast | 12° /7° | 0 mm | 0 cm | |
| Dec. 25 | Light rain shower | 13° /7° | 8 mm | 0 cm | |
| Dec. 26 | Sunny | 9° /4° | 2 mm | 0 cm | |
| Dec. 27 | Light drizzle | 9° /4° | 25.5 mm | 0.1 cm | |
| Dec. 28 |  Moderate snow | 8° /5° | 9 mm | 0.4 cm | |
| Dec. 29 |  Heavy snow | 7° /5° | 29.5 mm | 1.6 cm | |
| Dec. 30 | Overcast | 9° /4° | 0 mm | 0 cm | |
| Dec. 31 | Partly cloudy | 8° /1° | 0 mm | 0 cm | |
| Next | |||||
Important Notice
Our weather forecast for Williamson 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 Williamson County forecast closer to your planned date for the most up-to-date weather information.
Change Month
Williamson County in December - FAQ
What are the expected maximum and minimum temperatures in Williamson County during December?
Prepare for cooler days with highs just around 7° and colder nights, dipping below 1°.
How much rainfall should be expected in Williamson County during December?
Significant rainfall exceeding 164.9 mm is expected in Williamson County during December, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Williamson County in December 2025?
Williamson County experiences an average snowfall of 2.02 cm during December, occurring over 2 days.
What are the typical wind conditions in Williamson County during December?
The average wind speed in Williamson County during December is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
Williamson County snow forecast December 2025
Track daily snowfall levels and discover Williamson County’s snowy potential this December ❄️
December rainfall patterns in Williamson County
Explore the daily rainfall trends and prepare for Williamson Countys December weather 💧
Top locations in Williamson County
Select a location for an accurate weather forecast
More Locations Quick links
More Williamson County weather pages
You are here
Where is Williamson County?Get accurate weather forecasts for Williamson County, located at latitude 37.774 and longitude -89.026. Stay updated with localized weather information tailored for Williamson County.
Found a mistake?
We appreciate your attention to details. Tell us here.