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7 Days
14 Days
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°C
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Monthly Historical Averages
Cornwall, ON
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December
Average Temperature
High
-1°
Feels -4
Low
-8°
Feels -13
Average Precipitation
9 Days
Rain amount
13.6mm
Snow amount
32.7cm
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
-3°
26
-14°
27
-10°
28
-8°
29
2°
30
-12°
31
-10°
Forecast
Thursday, December 25, 2025
Day
-3°
Feels -8
Wind
23 km/h NW
Gust
35 km/h
Humidity
53%
P.O.P
40%
Snow
<1 cm
Night
-19°
Feels -25
Wind
18 km/h NW
Gust
27 km/h
Humidity
77%
P.O.P
10%
Historical Averages
Dec 25
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.