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Monthly
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Current
Hourly
7 Days
14 Days
Monthly
°C
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Monthly Historical Averages
Ottawa, IL
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December
Average Temperature
High
3°
Feels -1
Low
-5°
Feels -10
Average Precipitation
7 Days
Rain amount
25.7mm
Snow amount
7.9cm
Daily Historical Averages
December 2025
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
14°
29
-6°
30
-3°
31
-1°
Forecast
Sunday, December 28, 2025
Day
14°
Feels 14
Wind
38 km/h SW
Gust
57 km/h
Humidity
87%
P.O.P
100%
Rain
~20 mm
Night
-8°
Feels -19
Wind
49 km/h W
Gust
74 km/h
Humidity
87%
P.O.P
60%
Snow
~1 cm
Historical Averages
Dec 28
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.