WeatherWX.com
Thunder Bay Monthly Climate Averages
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi 16°F Lo 3°F | Hi 17°F Lo 4°F | Hi 30°F Lo 17°F | Hi 40°F Lo 28°F | Hi 54°F Lo 40°F | Hi 64°F Lo 49°F | Hi 71°F Lo 57°F | Hi 71°F Lo 57°F | Hi 62°F Lo 50°F | Hi 48°F Lo 39°F | Hi 35°F Lo 26°F | Hi 23°F Lo 12°F |
| 9 mph | 9 mph | 8 mph | 8 mph | 7 mph | 6 mph | 7 mph | 7 mph | 8 mph | 9 mph | 10 mph | 10 mph |
| 1.2 in | 1.2 in | 1.7 in | 3.6 in | 3.2 in | 3.3 in | 3.5 in | 3.2 in | 3.8 in | 2.9 in | 2.4 in | 2 in |
| 91% | 90% | 86% | 80% | 71% | 74% | 74% | 76% | 78% | 78% | 81% | 87% |
| 68% | 67% | 63% | 57% | 44% | 40% | 34% | 34% | 38% | 49% | 57% | 67% |
| 30.1 in | 30.1 in | 30.1 in | 30.0 in | 30.0 in | 29.9 in | 29.9 in | 29.9 in | 30.0 in | 29.9 in | 30.0 in | 30.0 in |
| 19 | 17 | 20 | 17 | 25 | 23 | 24 | 24 | 23 | 23 | 18 | 16 |
| 8 | 7 | 6 | 7 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 10 |
| 4 | 5 | 5 | 5 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 5 |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 2 | 3 | 4 | 5 | 5 | 3 | 2 | 1 | 1 |
| 71 | 72 | 92 | 121 | 186 | 196 | 225 | 230 | 195 | 144 | 110 | 77 |
January |
February |
March |
April |
May |
June |
July |
August |
September |
October |
November |
December |
| Hi -9°C Lo -16°C | Hi -8°C Lo -16°C | Hi -1°C Lo -8°C | Hi 4°C Lo -2°C | Hi 12°C Lo 4°C | Hi 18°C Lo 9°C | Hi 22°C Lo 14°C | Hi 22°C Lo 14°C | Hi 17°C Lo 10°C | Hi 9°C Lo 4°C | Hi 2°C Lo -3°C | Hi -5°C Lo -11°C |
| 15 km/h | 15 km/h | 13 km/h | 14 km/h | 11 km/h | 10 km/h | 11 km/h | 11 km/h | 13 km/h | 14 km/h | 15 km/h | 16 km/h |
| 31 mm | 31 mm | 43 mm | 91 mm | 81 mm | 82 mm | 90 mm | 81 mm | 96 mm | 74 mm | 60 mm | 51 mm |
| 91% | 90% | 86% | 80% | 71% | 74% | 74% | 76% | 78% | 78% | 81% | 87% |
| 68% | 67% | 63% | 57% | 44% | 40% | 34% | 34% | 38% | 49% | 57% | 67% |
| 1018 mb | 1019 mb | 1019 mb | 1016 mb | 1015 mb | 1012 mb | 1013 mb | 1013 mb | 1015 mb | 1014 mb | 1016 mb | 1017 mb |
| 19 | 17 | 20 | 17 | 25 | 23 | 24 | 24 | 23 | 23 | 18 | 16 |
| 8 | 7 | 6 | 7 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 10 |
| 4 | 5 | 5 | 5 | 0 | 0 | 0 | 0 | 0 | 1 | 4 | 5 |
| 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 1 | 1 | 1 | 2 | 3 | 4 | 5 | 5 | 3 | 2 | 1 | 1 |
| 71 | 72 | 92 | 121 | 186 | 196 | 225 | 230 | 195 | 144 | 110 | 77 |
| Month |
| Avg. Temperatures |
| Avg. Wind Speed |
| Avg. Precipitation |
| Average Humidity |
| Avg. Cloud Cover |
| Pressure Average |
| Average Dry Days |
| Avg. Precip. Days |
| Avg. Snow Days |
| Average Fog Days |
| Average UV Index |
| Avg. Hours of Sun |
Averages are based on historical weather data from the past 10 years.