
Boston Harbor Islands National and State Park
- Annual mean
- 9.3 °C
- Warmest month
- July
- Wettest month
- October
Review twelve-month atmospheric records for temperature, precipitation, and wind speeds
Access consistent long-term climate data for Narragansett Bay National Estuarine Research Reserve based on NASA POWER records from 1991 to 2020. This profile details monthly averages for temperature, precipitation, relative humidity, wind speed, and daylight hours derived from a single representative point. These measurements provide a foundational understanding of the annual environmental rhythm and atmospheric patterns within the marine protected area.
Long term monthly temperature averages and precipitation rates across twelve months at a representative coordinate
Compare average temperature bounds, daily precipitation rates, humidity, wind speed, and calculated daylight across the calendar year.
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | -0.2 °C-13° to 11.8° | 2.9 mm/day | 84.3% | 4.6 m/s | 9.4 hours |
| February | 0 °C-11.6° to 9.9° | 2.9 mm/day | 83% | 4.5 m/s | 10.4 hours |
| March | 2.8 °C-7.9° to 13.8° | 3.6 mm/day | 81.8% | 4.4 m/s | 11.7 hours |
| April | 7.7 °C-1.3° to 18.7° | 3.4 mm/day | 80.7% | 3.9 m/s | 13.1 hours |
| May | 13 °C4.3° to 24.1° | 2.7 mm/day | 80.7% | 3.4 m/s | 14.4 hours |
| June | 18.2 °C9.2° to 27.6° | 3.1 mm/day | 80.9% | 3.1 m/s | 15 hours |
| July | 22.1 °C14.7° to 30.4° | 2.6 mm/day | 78.5% | 2.9 m/s | 14.7 hours |
| August | 22 °C14.3° to 30.1° | 3 mm/day | 78% | 2.9 m/s | 13.6 hours |
| September | 18.8 °C9.1° to 27.8° | 3.4 mm/day | 77.8% | 3.3 m/s | 12.2 hours |
| October | 13.3 °C2.8° to 23.2° | 3.5 mm/day | 78% | 3.9 m/s | 10.8 hours |
| November | 7.8 °C-2.9° to 18° | 3.2 mm/day | 80% | 4.2 m/s | 9.6 hours |
| December | 3 °C-7.8° to 14.2° | 3.6 mm/day | 82.9% | 4.5 m/s | 9 hours |
Comparing long term monthly normals for temperature, precipitation, wind, humidity, 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 daylight trends across diverse regional landscapes.





Delve into the mapped terrain and estuarine boundaries of this Rhode Island marine protected area. Use MoriAtlas to trace the multi-island geography, tidal channels, and research-focused coastal zones that define this essential protected landscape.