Weather in Thunder Bay: December
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Average day temperature: | 22.5°F |
| Average night temperature: | 20.6°F | |
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Sea water temperature: | 38.6°F |
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Number of sunny days: | 5 days |
| Day length: | 8.3 - 8.6 hours | |
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Number of days with precipitation: | 1 day |
| Precipitation totals: | 0.6 in. | |
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| Thunder Bay |
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| Thunder Bay |
Air temperature in December, °F
| Day temperature | Night temperature |
The highest day temperature during December of 2024 was 37°F. At the same time the lowest night temperature was -4°F. Daily and nightly averages during December were 24.0°F and 20.7°F.
Sea water temperature in Thunder Bay in December, °F
The average sea water temperature in December of 2024 was 39.2°F. The highest and lowest sea temperatures during the month were 43.0°F and 36.0°F.
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| Partly cloudy days | |
| Cloudy days |
Mostly all days in December are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in December, in.
Precipitation total value in Thunder Bay in December is 0.6 in. Other months of the year show relatively similar values.
The average wind speed value in December is 9.1 mph It makes December one of the most windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in December is: 2.8.
Best time for vacation in Thunder Bay
Thunder Bay on a weather map
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