Williamson County (Energy)
January
Weather in Williamson County, Illinois for January 2026
Your guide to Williamson County weather in January - trends and predictions
With an average of 4 snowy days, Williamson County usually enjoys a light touch of snow in January.
In general, the average temperature in Williamson County at the beginning of January is 3.4 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 8 °F by the end of January.
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Snow Forecast ❄️
Temperatures
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17
Dry days
10
Rainy days
4
Snow days
2°/-4°
Temperatures
21 km/h
Avg max wind
74 %
Avg humidity
Williamson County Weather January
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Temperatures trend during January in Williamson County
See the weather trend as well as the moving average line
January weather in Williamson County day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Jan. 1 |  Partly cloudy | 4° /-1° | 0 mm | 0 cm | |
| Jan. 2 |  Overcast | 5° /-1° | 0 mm | 0 cm | |
| Jan. 3 | Overcast | 6° /-1° | 0 mm | 0 cm | |
| Jan. 4 |  Sunny | 4° /-3° | 0 mm | 0 cm | |
| Jan. 5 |  Patchy rain possible | 2° /-2° | 33.4 mm | 6.8 cm | |
| Jan. 6 | Patchy rain possible | 3° /-1° | 5.7 mm | 2.6 cm | |
| Jan. 7 | Patchy rain possible | 0° /-8° | 0 mm | 0 cm | |
| Jan. 8 | Overcast | 0° /-9° | 7.7 mm | 0 cm | |
| Jan. 9 | Light rain shower | 4° /-4° | 10.8 mm | 0 cm | |
| Jan. 10 | Partly cloudy | 3° /-3° | 12.2 mm | 8.8 cm | |
| Jan. 11 | Partly cloudy | 4° /-2° | 0 mm | 0 cm | |
| Jan. 12 |  Light snow showers | 5° /-5° | 29.8 mm | 0 cm | |
| Jan. 13 |  Light snow | 0° /-8° | 0 mm | 0 cm | |
| Jan. 14 | Light snow | -5° /-11° | 0.1 mm | 0.1 cm | |
| Jan. 15 |  Light freezing rain | -4° /-11° | 0 mm | 0 cm | |
| Jan. 16 | Overcast | -3° /-8° | 0.1 mm | 0 cm | |
| Jan. 17 | Sunny | 2° /-8° | 2.2 mm | 0 cm | |
| Jan. 18 |  Heavy snow | 2° /-5° | 10.2 mm | 0.4 cm | |
| Jan. 19 | Light snow | -3° /-11° | 0.1 mm | 0 cm | |
| Jan. 20 |  Cloudy | -5° /-13° | 0 mm | 0 cm | |
| Jan. 21 | Overcast | -4° /-11° | 0 mm | 0 cm | |
| Jan. 22 |  Light drizzle | 1° /-8° | 0.9 mm | 0 cm | |
| Jan. 23 | Light rain | 2° /-2° | 4.3 mm | 0 cm | |
| Jan. 24 | Light rain shower | 6° /-3° | 6.1 mm | 0 cm | |
| Jan. 25 | Light rain | 8° /2° | 3.6 mm | 0 cm | |
| Jan. 26 |  Mist | 7° /1° | 0 mm | 0 cm | |
| Jan. 27 |  Moderate rain | 7° /0° | 3.5 mm | 0 cm | |
| Jan. 28 | Patchy rain possible | 7° /1° | 0.2 mm | 0 cm | |
| Jan. 29 | Mist | 9° /0° | 0 mm | 0 cm | |
| Jan. 30 | Light drizzle | 8° /3° | 27.1 mm | 0 cm | |
| Jan. 31 | Mist | 10° /3° | 0.7 mm | 0 cm | |
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Important Notice
Our weather forecast for Williamson County in January 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 January - FAQ
What are the expected maximum and minimum temperatures in Williamson County during January?
Brace for cold days with temperatures not exceeding 2° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Williamson County during January?
Significant rainfall exceeding 158.9 mm is expected in Williamson County during January, occurring over more than 10 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Williamson County in January 2026?
Williamson County experiences an average snowfall of 18.735 cm during January, occurring over 4 days.
What are the typical wind conditions in Williamson County during January?
The average wind speed in Williamson County during January is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
Williamson County snow forecast January 2026
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January rainfall patterns in Williamson County
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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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