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Monthly Historical Averages
Thunder Bay, ON
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December
Average Temperature
High
-5°
Feels -9
Low
-14°
Feels -20
Average Precipitation
9 Days
Rain amount
0mm
Snow amount
58.9cm
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
-4°
25
-7°
26
1°
27
2°
28
-1°
29
-15°
30
-12°
31
-17°
Forecast
Wednesday, December 24, 2025
Day
-4°
Feels -7
Wind
10 km/h W
Gust
14 km/h
Humidity
79%
P.O.P
30%
Night
-13°
Feels -20
Wind
14 km/h N
Gust
21 km/h
Humidity
86%
P.O.P
20%
Historical Averages
Dec 24
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.