
Mallows Bay–Potomac River National Marine Sanctuary
- Annual mean
- 13.1 °C
- Warmest month
- July
- Wettest month
- September
Long-term atmospheric patterns defined by monthly temperature, precipitation, and daylight data
This climate profile presents twelve-month averages for Chesapeake Bay National Estuarine Research Reserve, Virginia, based on NASA POWER data from 1991 to 2020. These metrics represent long-term climatological conditions at a single representative coordinate, including mean temperatures, precipitation rates, relative humidity, wind speed, and daylight hours. The data provides a standardized view of the annual atmospheric rhythm observed at the site, distinct from real-time weather forecasts or current conditions.
Long-term monthly averages for temperature progression and daily precipitation rates across twelve calendar months
Analyze long-term temperature bounds, precipitation rates, humidity, wind speed, and calculated daylight across the calendar year.
| Mean temperature | Precipitation | Humidity | Wind speed | Daylight | |
|---|---|---|---|---|---|
| January | 2.4 °C-10.1° to 18.7° | 2.7 mm/day | 82.7% | 2.9 m/s | 9.7 hours |
| February | 3.9 °C-8.2° to 19.2° | 2.6 mm/day | 81.2% | 2.9 m/s | 10.6 hours |
| March | 7.9 °C-5.3° to 23.2° | 3.2 mm/day | 78.8% | 3 m/s | 11.8 hours |
| April | 13.7 °C0° to 27.8° | 2.9 mm/day | 76.1% | 2.9 m/s | 13 hours |
| May | 18.9 °C6.2° to 31.7° | 3.2 mm/day | 75.5% | 2.5 m/s | 14 hours |
| June | 24 °C12° to 35.6° | 3.6 mm/day | 72.3% | 2.2 m/s | 14.5 hours |
| July | 26.6 °C16.7° to 37.3° | 4.1 mm/day | 70% | 2 m/s | 14.3 hours |
| August | 25.5 °C15.7° to 36.1° | 4 mm/day | 72.3% | 2 m/s | 13.4 hours |
| September | 21.9 °C10.3° to 33.4° | 4 mm/day | 74.9% | 2.3 m/s | 12.2 hours |
| October | 15.5 °C2.3° to 29.4° | 3.2 mm/day | 76.8% | 2.4 m/s | 11 hours |
| November | 9.1 °C-3.3° to 23.5° | 2.7 mm/day | 78.7% | 2.6 m/s | 10 hours |
| December | 4.6 °C-6.3° to 20° | 2.9 mm/day | 82.7% | 2.6 m/s | 9.5 hours |
Comparative monthly averages for temperature, precipitation, humidity, wind, and daylight duration across the park.
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.
Month-by-month atmospheric records and climate patterns across diverse protected landscapes and geographic settings.






Delve into the multi-component landscape of the Chesapeake Bay National Estuarine Research Reserve, Virginia to see how tidal habitats shift along the York River salinity gradient. MoriAtlas provides a clear map of these protected areas, offering insights into the coastal terrain and estuarine ecology of this important Virginia research site.