Decatur (IL)
December
Weather in Decatur, Illinois for December 2026
Your guide to Decatur weather in December - trends and predictions
With an average of 4 snowy days, Decatur usually enjoys a light touch of snow in December.
In general, the average temperature in Decatur at the beginning of December is 0.3 °C. As the month progressed, temperatures tended to significantly warm up, reaching an average of 6.7 °C by the end of December.
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Snow Forecast ❄️
Temperatures
More
19
Dry days
8
Rainy days
4
Snow days
3°/-2°
Temperatures
23 km/h
Avg max wind
82 %
Avg humidity
Decatur Weather December
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Temperatures trend during December in Decatur
See the weather trend as well as the moving average line
December weather in Decatur day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| Dec. 1 |  Sunny | 0° /-6° | 1.4 mm | 0.4 cm | |
| Dec. 2 |  Overcast | -1° /-5° | 8.2 mm | 4.4 cm | |
| Dec. 3 | Sunny | 0° /-7° | 0 mm | 0 cm | |
| Dec. 4 | Overcast | 0° /-6° | 0 mm | 0 cm | |
| Dec. 5 | Sunny | -1° /-11° | 0 mm | 0 cm | |
| Dec. 6 |  Partly cloudy | 0° /-5° | 0 mm | 0 cm | |
| Dec. 7 | Sunny | 4° /-4° | 0 mm | 0 cm | |
| Dec. 8 |  Cloudy | 4° /-3° | 0 mm | 0 cm | |
| Dec. 9 |  Moderate rain | 5° /-1° | 4.7 mm | 0 cm | |
| Dec. 10 | Overcast | 4° /-2° | 0 mm | 0 cm | |
| Dec. 11 |  Light snow | 0° /-4° | 0 mm | 0 cm | |
| Dec. 12 | Overcast | -1° /-4° | 4.3 mm | 3.1 cm | |
| Dec. 13 | Overcast | -1° /-8° | 11.2 mm | 8.1 cm | |
| Dec. 14 |  Moderate or heavy rain shower | -4° /-9° | 23.4 mm | 0 cm | |
| Dec. 15 |  Fog | 1° /-8° | 2.4 mm | 0 cm | |
| Dec. 16 | Overcast | 5° /-2° | 0 mm | 0 cm | |
| Dec. 17 |  Freezing fog | 5° /-2° | 0 mm | 0 cm | |
| Dec. 18 |  Light rain | 5° /0° | 1.6 mm | 0 cm | |
| Dec. 19 | Overcast | 1° /-4° | 0 mm | 0 cm | |
| Dec. 20 | Overcast | 3° /-3° | 0 mm | 0 cm | |
| Dec. 21 | Sunny | 2° /-3° | 0 mm | 0 cm | |
| Dec. 22 | Partly cloudy | 5° /-2° | 0 mm | 0 cm | |
| Dec. 23 | Overcast | 4° /0° | 0 mm | 0 cm | |
| Dec. 24 | Freezing fog | 3° /0° | 0 mm | 0 cm | |
| Dec. 25 | Mist | 5° /2° | 0 mm | 0 cm | |
| Dec. 26 | Fog | 8° /4° | 0 mm | 0 cm | |
| Dec. 27 | Moderate or heavy rain shower | 9° /6° | 12.2 mm | 0 cm | |
| Dec. 28 | Overcast | 14° /8° | 5.3 mm | 0 cm | |
| Dec. 29 | Moderate rain | 3° /0° | 9.3 mm | 0 cm | |
| Dec. 30 | Overcast | 4° /-2° | 0 mm | 0 cm | |
| Dec. 31 | Light rain | 4° /-1° | 5.7 mm | 0 cm | |
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Important Notice
Our weather forecast for Decatur 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 Decatur forecast closer to your planned date for the most up-to-date weather information.
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Decatur in December - FAQ
What are the expected maximum and minimum temperatures in Decatur 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 Decatur during December?
Moderate rainfall is anticipated in Decatur during December, with a total of 89.8 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
Will it snow in Decatur in December 2026?
Decatur experiences an average snowfall of 16.08 cm during December, occurring over 4 days.
What are the typical wind conditions in Decatur during December?
The average wind speed in Decatur during December is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
Decatur snow forecast December 2026
Track daily snowfall levels and discover Decatur’s snowy potential this December ❄️
On average, Decatur sees 4 snowy days during December, with approximately 16.1 cm of total snowfall.
December rainfall patterns in Decatur
Explore the daily rainfall trends and prepare for Decaturs December weather 💧
Typically, Decatur has 8 rainy days in December with a total of 89.8 mm of rainfall.
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Where is Decatur?Get accurate weather forecasts for Decatur, located at latitude 39.84 and longitude -88.955. Stay updated with localized weather information tailored for Decatur.
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