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Decatur (IL)
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Weather in Decatur, Illinois for December 2025

Your guide to Decatur weather in December - trends and predictions

    Snow Forecast ❄️

  • Snowfall in Decatur during December is quite rare, with fewer than 2 snowy days on average.
    According to Decatur snow forecast for December 2025, 1 snowy day is expected until the end of the month at Friday, December 19.

    • Temperatures

  • Until now, December 2025 in Decatur is slightly cooler than the historical average by -1.2 °F.

  • The forecast for the coming days of December 2025 predicts a temperature of 5.6 °F , which is warmer than usual.

  • In general, the average temperature in Decatur at the beginning of December is 0.3 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 8.6 °F by the end of December.

    • Rain 🌧️

  • Decatur experiences moderate rainfall in December, with an average of 7 rainy days and a total precipitation of 118.6 mm.

    • More

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Average dry days
24
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
4°/-1°
Temperatures
Average wind speed
23 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Decatur Weather December

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

Temperatures trend during December in Decatur

See the weather trend as well as the moving average line

December weather in Decatur day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
Dec. 1 Sunny
Sunny
 0° /-6° 1.4 mm 0.4 cm
Dec. 2 Overcast
Overcast
 -1° /-5° 8.2 mm 4.4 cm
Dec. 3 Sunny
Sunny
 0° /-7° 0 mm 0 cm
Dec. 4 Overcast
Overcast
 0° /-6° 0 mm 0 cm
Dec. 5 Sunny
Sunny
 -1° /-11° 0 mm 0 cm
Dec. 6 Partly cloudy
Partly cloudy
 0° /-5° 0 mm 0 cm
Dec. 7 Sunny
Sunny
 4° /-4° 0 mm 0 cm
Dec. 8 Cloudy
Cloudy
 4° /-3° 0 mm 0 cm
Dec. 9 Moderate rain
Moderate rain
 5° /-1° 4.7 mm 0 cm
Dec. 10 Overcast
Overcast
 4° /-2° 0 mm 0 cm
Dec. 11 Light snow
Light snow
 0° /-4° 0 mm 0 cm
Dec. 12 Overcast
Overcast
 -1° /-4° 4.3 mm 3.1 cm
Dec. 13 Overcast
Overcast
 -1° /-8° 11.2 mm 8.1 cm
Dec. 14 Moderate or heavy rain shower
Moderate or heavy rain shower
 -4° /-9° 23.4 mm 0 cm
Dec. 15 Sunny
Sunny
 0° /-23° 0 mm 0 cm
Dec. 16 Cloudy
Cloudy
 2° /-9° 0 mm 0 cm
Dec. 17 Freezing fog
Freezing fog
 0° /-3° 0 mm 0 cm
Dec. 18 Moderate rain
Moderate rain
 5° /-5° 9.3 mm 0 cm
Dec. 19 Partly cloudy
Partly cloudy
 -3° /-9° 0 mm 0 cm
Dec. 20 Sunny
Sunny
 6° /-3° 0 mm 0 cm
Dec. 21 Partly cloudy
Partly cloudy
 3° /-4° 0 mm 0 cm
Dec. 22 Patchy rain possible
Patchy rain possible
 2° /0° 0.5 mm 0 cm
Dec. 23 Overcast
Overcast
 14° /2° 0 mm 0 cm
Dec. 24 Cloudy
Cloudy
 14° /5° 0.1 mm 0 cm
Dec. 25 Patchy rain possible
Patchy rain possible
 9° /2° 0.1 mm 0 cm
Dec. 26 Patchy rain possible
Patchy rain possible
 6° /1° 0.2 mm 0 cm
Dec. 27 Sunny
Sunny
 9° /-2° 0 mm 0 cm
Dec. 28 Sunny
Sunny
 12° /3° 0 mm 0 cm
Dec. 29 Moderate rain
Moderate rain
 9° /8° 18.6 mm 0 cm
Dec. 30 Overcast
Overcast
 8° /5° 0 mm 0 cm
Dec. 31 Light rain
Light rain
 7° /0° 11.4 mm 0 cm
Next
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 4° 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?
Significant rainfall exceeding 118.6 mm is expected in Decatur during December, occurring over more than 7 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Decatur in December 2025?
Decatur typically sees 0 cm of snowfall during December.
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 2025

Track daily snowfall levels and discover Decatur’s snowy potential this December ❄️

December rainfall patterns in Decatur

Explore the daily rainfall trends and prepare for Decaturs December weather 💧
Typically, Decatur has 7 rainy days in December with a total of 118.6 mm of rainfall.

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Location coordinates 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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