Thunder Bay
December
Weather in Thunder Bay for December 2025
Your guide to Thunder Bay weather in December - trends and predictions
Thunder Bay typically experiences moderate snowfall in December, with an average of 8 snowy days.
In general, the average temperature in Thunder Bay at the beginning of December is -0.7 °C. As the month progressed, temperatures tended to moderately rise, reaching an average of 1.1 °C by the end of December.
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Snow Forecast ❄️
Temperatures
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16
Dry days
7
Rainy days
8
Snow days
1°/-5°
Temperatures
19 km/h
Avg max wind
77 %
Avg humidity
Thunder Bay in December average weather
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| Sun. | Mon. | Tue. | Wed. | Thu. | Fri. | Sat. |
|---|---|---|---|---|---|---|
| 1  1° | 2  -2° | 3  -1° | 4 -1° | 5  -2° | 6 -1° | |
| 7 1° | 8  2° | 9 1° | 10 -3° | 11 -4° | 12 -7° | 13 -5° |
| 14 3° | 15  4° | 16  3° | 17 1° | 18  -4° | 19 -4° | 20 -4° |
| 21 -4° | 22  0° | 23 0° | 24 3° | 25  3° | 26 1° | 27 2° |
| 28 2° | 29 1° | 30 -0° | 31 -1° |
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Temperatures trend during December in Thunder Bay
See the weather trend as well as the moving average line
December weather day by day
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| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Dec. | Partly cloudy | 1° /-7° | 0 mm | 0 cm | |
| 2 Dec. | Overcast | -2° /-8° | 0 mm | 0 cm | |
| 3 Dec. | Light snow showers | -1° /-6° | 5.7 mm | 1 cm | |
| 4 Dec. | Overcast | -1° /-7° | 6.9 mm | 5 cm | |
| 5 Dec. | Light snow | -2° /-7° | 0.2 mm | 0.1 cm | |
| 6 Dec. | Light snow | -1° /-7° | 0.9 mm | 0 cm | |
| 7 Dec. | Overcast | 1° /-6° | 5.9 mm | 3.3 cm | |
| 8 Dec. | Fog | 2° /-2° | 7.4 mm | 5.3 cm | |
| 9 Dec. | Light snow | 1° /-5° | 30 mm | 0 cm | |
| 10 Dec. | Partly cloudy | -3° /-9° | 0 mm | 0 cm | |
| 11 Dec. | Overcast | -4° /-16° | 0 mm | 0 cm | |
| 12 Dec. | Light snow | -7° /-15° | 0 mm | 0 cm | |
| 13 Dec. | Partly cloudy | -5° /-13° | 0 mm | 0 cm | |
| 14 Dec. | Overcast | 3° /-6° | 0 mm | 0 cm | |
| 15 Dec. | Light rain | 4° /-1° | 2.2 mm | 0 cm | |
| 16 Dec. | Moderate snow | 3° /-1° | 0.9 mm | 0.1 cm | |
| 17 Dec. | Light snow | 1° /-4° | 0.2 mm | 0.1 cm | |
| 18 Dec. | Cloudy | -4° /-11° | 0 mm | 0 cm | |
| 19 Dec. | Overcast | -4° /-12° | 0 mm | 0 cm | |
| 20 Dec. | Overcast | -4° /-10° | 0 mm | 0 cm | |
| 21 Dec. | Light snow | -4° /-11° | 0.1 mm | 0.1 cm | |
| 22 Dec. | Light freezing rain | 0° /-5° | 0 mm | 0 cm | |
| 23 Dec. | Fog | 0° /-3° | 0.1 mm | 0 cm | |
| 24 Dec. | Fog | 3° /-4° | 1.7 mm | 0 cm | |
| 25 Dec. | Light sleet | 3° /-2° | 5.1 mm | 0 cm | |
| 26 Dec. | Light freezing rain | 1° /-1° | 3.4 mm | 0 cm | |
| 27 Dec. | Light freezing rain | 2° /0° | 0.1 mm | 0 cm | |
| 28 Dec. | Cloudy | 2° /0° | 24 mm | 0 cm | |
| 29 Dec. | Partly cloudy | 1° /-1° | 0 mm | 0 cm | |
| 30 Dec. | Cloudy | 0° /-3° | 0 mm | 0 cm | |
| 31 Dec. | Moderate snow | -1° /-5° | 0.2 mm | 0.1 cm | |
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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.
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 85.4 mm spread over approximately 7 days. Considering plans for rainy days is advisable.
Will it snow in Thunder Bay in December 2025?
Thunder Bay experiences an average snowfall of 15.535 cm during December, occurring over 8 days.
What are the typical wind conditions in Thunder Bay during December?
The average wind speed in Thunder Bay during December is 19 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 ❄️
December rainfall patterns in Thunder Bay
Explore the daily rainfall trends and prepare for Thunder Bays December weather 💧
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