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Weather in Thunder Bay
Average Weather
| Month | Average monthly max temperature | Average monthly min temperature |
| January | -8°C | -15°C |
| February | -7°C | -15°C |
| March | -1°C | -8°C |
| April | 4°C | -1°C |
| May | 12°C | 4°C |
| June | 17°C | 9°C |
| July | 21°C | 13°C |
| August | 21°C | 13°C |
| September | 17°C | 10°C |
| October | 9°C | 4°C |
| November | 2°C | -3°C |
| December | -4°C | -10°C |
14 day forecast
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