Thunder Bay National Marine Sanctuary
- Annual mean
- 7 °C
- Warmest month
- August
- Wettest month
- August
Long-term atmospheric patterns including temperature, precipitation, and wind speeds
Examine the twelve-month climate profile of Thunder Bay National Marine Sanctuary and Underwater Preserve based on NASA POWER measurements from 1991 to 2020. This data details average monthly temperature, precipitation rates, relative humidity, wind speed, and daylight hours at a single representative coordinate. These statistics provide a standardized view of historical climatic trends rather than current weather observations or localized variations across the marine protected area.
Long-term monthly temperature averages and daily precipitation rates across twelve months
Twelve Month Climatology of Temperatures, Precipitation, Humidity, Wind, and Daylight
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | -3.7 °C-12.1° to 4.5° | 1.4 mm/day | 88.5% | 7.5 m/s | 9 hours |
| February | -4.1 °C-13° to 4.3° | 1.3 mm/day | 86.8% | 7.1 m/s | 10.2 hours |
| March | -1 °C-10.6° to 8.7° | 1.4 mm/day | 82.7% | 6.4 m/s | 11.7 hours |
| April | 3.4 °C-3.1° to 13.1° | 2.5 mm/day | 80.8% | 6 m/s | 13.3 hours |
| May | 7.8 °C2° to 17.6° | 2.3 mm/day | 83.6% | 4.9 m/s | 14.7 hours |
| June | 13 °C6.1° to 22.1° | 2.4 mm/day | 84.7% | 4.3 m/s | 15.4 hours |
| July | 18.5 °C12.4° to 25.2° | 2.4 mm/day | 81.3% | 4.3 m/s | 15 hours |
| August | 19.5 °C14.5° to 25.7° | 2.5 mm/day | 79% | 4.8 m/s | 13.8 hours |
| September | 16.3 °C9° to 23.8° | 2.3 mm/day | 77.8% | 5.6 m/s | 12.3 hours |
| October | 10.1 °C3.5° to 19.1° | 2.4 mm/day | 79.1% | 6.6 m/s | 10.7 hours |
| November | 4.4 °C-2.5° to 12.4° | 1.8 mm/day | 81.1% | 7.2 m/s | 9.3 hours |
| December | -0.3 °C-8.4° to 7.1° | 1.5 mm/day | 85.1% | 7.4 m/s | 8.6 hours |
Comparing twelve stored monthly normals for temperature, precipitation, humidity, wind, and daylight duration
Interactive climate map
Visit the MoriAtlas climate map to compare long-term monthly temperature and precipitation metrics across national parks. This visual interface helps you understand seasonal variations at specific protected area coordinates to deepen your knowledge of global park geography and environmental characteristics.
Explore monthly temperature, precipitation, and regional atmospheric normals across diverse conservation landscapes





Discover the maritime heritage and freshwater geography contained within the boundaries of Thunder Bay National Marine Sanctuary and Underwater Preserve. This MoriAtlas profile details the submerged archaeological sites and coastal environments that define this significant marine protected area along the shores of Michigan.