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Canada weather

Weather in Thunder Bay for December 2025

Your guide to Thunder Bay weather in December - trends and predictions

    Snow Forecast ❄️

  • Thunder Bay typically experiences moderate snowfall in December, with an average of 7 snowy days.
    According to Thunder Bay snow forecast for December 2025, 8 snowy days are expected in the next 2 weeks. The closest date with snow is Sunday, 14 December.

    • Temperatures

  • Until now, December 2025 in Thunder Bay is cooler than usual, with temperatures averaging -5.2 °C, this is -2.7 °C below the typical seasonal average.

  • The forecast for the next days in Thunder Bay predicts a temperature of -10.6 °C, which is cooler than the historical average.

  • In general, the average temperature in Thunder Bay at the beginning of December is -2.1 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of -6.9 °C by the end of December.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
16
Dry days
Average rainy days
8
Rainy days
Average snowy days
7
Snow days
Average temperatures
-1°/-6°
Temperatures
Average wind speed
18 km/h
Avg max wind
Average humidity
79 %
Avg humidity

Thunder Bay Weather December

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

Temperatures trend during December in Thunder Bay

See the weather trend as well as the moving average line

December weather in Thunder Bay day by day

Click on a date for more information
November January
Date Weather Temperatures Rain Snow More
1 Dec. Partly cloudy
Partly cloudy
 0° /-8° 0 mm 0 cm
2 Dec. Overcast
Overcast
 -2° /-9° 0 mm 0 cm
3 Dec. Light snow showers
Light snow showers
 -2° /-9° 3.8 mm 0.6 cm
4 Dec. Overcast
Overcast
 -3° /-10° 4.6 mm 3.3 cm
5 Dec. Light snow
Light snow
 -3° /-8° 0.9 mm 0.6 cm
6 Dec. Light snow
Light snow
 -3° /-9° 0.6 mm 0 cm
7 Dec. Overcast
Overcast
 -2° /-10° 3.9 mm 2.2 cm
8 Dec. Fog
Fog
 0° /-7° 4.9 mm 3.5 cm
9 Dec. Light snow
Light snow
 -1° /-7° 24.6 mm 3.3 cm
10 Dec. Partly cloudy
Partly cloudy
 -4° /-9° 0 mm 0 cm
11 Dec. Overcast
Overcast
 -4° /-14° 0 mm 0 cm
12 Dec. Light snow
Light snow
 -6° /-13° 0 mm 0 cm
13 Dec. Sunny
Sunny
 -8° /-15° 0 mm 0 cm
14 Dec. Light freezing rain
Light freezing rain
 -14° /-23° 0.2 mm 0.1 cm
15 Dec. Overcast
Overcast
 -4° /-10° 0 mm 0 cm
16 Dec. Moderate or heavy snow showers
Moderate or heavy snow showers
 -1° /-11° 4.8 mm 1.4 cm
17 Dec. Light freezing rain
Light freezing rain
 -6° /-11° 0.3 mm 0 cm
18 Dec. Blizzard
Blizzard
 1° /-9° 11.1 mm 2.7 cm
19 Dec. Moderate snow
Moderate snow
 -13° /-17° 1.1 mm 0.8 cm
20 Dec. Moderate or heavy snow showers
Moderate or heavy snow showers
 -8° /-12° 1.1 mm 0.8 cm
21 Dec. Partly cloudy
Partly cloudy
 -14° /-21° 0 mm 0 cm
22 Dec. Light snow
Light snow
 -1° /-9° 0.9 mm 0.7 cm
23 Dec. Overcast
Overcast
 -20° /-24° 0.1 mm 0 cm
24 Dec. Partly cloudy
Partly cloudy
 -19° /-27° 0 mm 0 cm
25 Dec. Light snow
Light snow
 -14° /-20° 0.2 mm 0.2 cm
26 Dec. Overcast
Overcast
 -20° /-24° 0 mm 0 cm
27 Dec. Partly cloudy
Partly cloudy
 -16° /-25° 0 mm 0 cm
28 Dec. Cloudy
Cloudy
 2° /0° 24 mm 0 cm
29 Dec. Partly cloudy
Partly cloudy
 1° /-1° 0 mm 0 cm
30 Dec. Cloudy
Cloudy
 0° /-3° 0 mm 0 cm
31 Dec. Moderate snow
Moderate snow
 -1° /-5° 0.2 mm 0.1 cm
Next
Important Notice
Our weather forecast for Thunder Bay 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 Thunder Bay forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Thunder Bay in December - FAQ

What are the expected maximum and minimum temperatures in Thunder Bay during December?
Brace for cold days with temperatures not exceeding -1° and nights that are likely to be freezing. Winter clothing is essential for comfort and safety.
How much rainfall should be expected in Thunder Bay during December?
Moderate rainfall is anticipated in Thunder Bay during December, with a total of 95.2 mm spread over approximately 8 days. Considering plans for rainy days is advisable.
Will it snow in Thunder Bay in December 2025?
Thunder Bay experiences an average snowfall of 15.145 cm during December, occurring over 7 days.
What are the typical wind conditions in Thunder Bay during December?
The average wind speed in Thunder Bay during December is 18 km/h, suggesting breezy to windy conditions, depending on your activities.

Thunder Bay snow forecast December 2025

Track daily snowfall levels and discover Thunder Bay’s snowy potential this December ❄️
On average, Thunder Bay sees 7 snowy days during December, with approximately 15.1 cm of total snowfall.

December rainfall patterns in Thunder Bay

Explore the daily rainfall trends and prepare for Thunder Bays December weather 💧
Typically, Thunder Bay has 8 rainy days in December with a total of 95.2 mm of rainfall.

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Get accurate weather forecasts for Thunder Bay, located at latitude 48.382 and longitude -89.25. Stay updated with localized weather information tailored for Thunder Bay.

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