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Williamson County (Energy)
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United States weather

Weather in Williamson County, Illinois for December 2025

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

    Snow Forecast ❄️

  • With an average of 2 snowy days, Williamson County usually enjoys a light touch of snow in December.
    According to Williamson County snow forecast for December 2025, no snow is expected until the end of the month.

    • Temperatures

  • Until now, December 2025 in Williamson County is slightly cooler than the historical average by -1.3 °F.

  • The forecast for the upcoming days in Williamson County predicts a temperature of 7.4 °F, which is slightly above the historical average.

  • In general, the average temperature in Williamson County at the beginning of December is 2.6 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 5.7 °F by the end of December.

    • Rain 🌧️

  • Williamson County experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 164.9 mm.

    • More

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

Average dry days
22
Dry days
Average rainy days
7
Rainy days
Average snowy days
2
Snow days
Average temperatures
7°/1°
Temperatures
Average wind speed
21 km/h
Avg max wind
Average humidity
71 %
Avg humidity

Williamson County Weather December

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

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
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Cloudy
Cloudy
 1° /-4° 0 mm 0 cm
Dec. 2 Overcast
Overcast
 0° /-2° 0 mm 0 cm
Dec. 3 Partly cloudy
Partly cloudy
 3° /-5° 0 mm 0 cm
Dec. 4 Overcast
Overcast
 2° /-4° 0 mm 0 cm
Dec. 5 Sunny
Sunny
 3° /-7° 0 mm 0 cm
Dec. 6 Partly cloudy
Partly cloudy
 3° /-4° 0 mm 0 cm
Dec. 7 Sunny
Sunny
 6° /-2° 0 mm 0 cm
Dec. 8 Overcast
Overcast
 5° /0° 0 mm 0 cm
Dec. 9 Light rain shower
Light rain shower
 11° /4° 4.8 mm 0 cm
Dec. 10 Overcast
Overcast
 8° /0° 0 mm 0 cm
Dec. 11 Partly cloudy
Partly cloudy
 5° /-1° 0 mm 0 cm
Dec. 12 Sunny
Sunny
 8° /-1° 0 mm 0 cm
Dec. 13 Overcast
Overcast
 7° /0° 0 mm 0 cm
Dec. 14 Sunny
Sunny
 5° /-3° 27 mm 0 cm
Dec. 15 Sunny
Sunny
 3° /-13° 0 mm 0 cm
Dec. 16 Overcast
Overcast
 1° /-3° 0 mm 0 cm
Dec. 17 Partly cloudy
Partly cloudy
 11° /0° 0 mm 0 cm
Dec. 18 Moderate rain
Moderate rain
 17° /1° 11.9 mm 0 cm
Dec. 19 Sunny
Sunny
 4° /-4° 0 mm 0 cm
Dec. 20 Patchy rain possible
Patchy rain possible
 12° /1° 0.8 mm 0 cm
Dec. 21 Moderate rain
Moderate rain
 7° /1° 6 mm 0 cm
Dec. 22 Sunny
Sunny
 8° /-2° 0 mm 0 cm
Dec. 23 Overcast
Overcast
 11° /3° 0 mm 0 cm
Dec. 24 Patchy rain possible
Patchy rain possible
 13° /5° 0.1 mm 0 cm
Dec. 25 Sunny
Sunny
 6° /-1° 0 mm 0 cm
Dec. 26 Patchy rain possible
Patchy rain possible
 7° /-4° 0.3 mm 0 cm
Dec. 27 Partly cloudy
Partly cloudy
 -2° /-8° 0 mm 0 cm
Dec. 28 Partly cloudy
Partly cloudy
 5° /-5° 0 mm 0 cm
Dec. 29 Heavy snow
Heavy snow
 7° /5° 29.5 mm 1.6 cm
Dec. 30 Overcast
Overcast
 9° /4° 0 mm 0 cm
Dec. 31 Partly cloudy
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.
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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 ❄️
On average, Williamson County sees 2 snowy days during December, with approximately 2 cm of total snowfall.

December rainfall patterns in Williamson County

Explore the daily rainfall trends and prepare for Williamson Countys December weather 💧
Typically, Williamson County has 7 rainy days in December with a total of 164.9 mm of rainfall.
Top locations in Williamson County
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Location coordinates 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.

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