
Rose Atoll National Wildlife Refuge
- Annual mean
- 27.5 °C
- Warmest month
- April
- Wettest month
- January
Twelve month analysis of temperature, precipitation, wind, and daylight averages from 1991 to 2020
Data provided for Rose Atoll Marine National Monument represents long-term climate normals based on a single representative coordinate measured between 1991 and 2020. Monthly patterns trace shifts in average temperature, daily precipitation rates, relative humidity, wind speed, and daylight hours. These values clarify the atmospheric conditions typical of the monument throughout the calendar year without representing current weather or site-wide variability.

Long-term monthly averages for minimum, mean, and maximum temperatures alongside daily precipitation rates
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 | 27.8 °C26.1° to 29.1° | 8.3 mm/day | 81.9% | 5.3 m/s | 12.8 hours |
| February | 27.9 °C26.4° to 29.1° | 7.9 mm/day | 81.7% | 5.4 m/s | 12.5 hours |
| March | 28 °C26.6° to 29.2° | 5.9 mm/day | 81.5% | 4.9 m/s | 12.1 hours |
| April | 28 °C26.7° to 29.2° | 5.3 mm/day | 80.8% | 5.1 m/s | 11.7 hours |
| May | 27.7 °C26.2° to 28.9° | 4.5 mm/day | 79.8% | 5.9 m/s | 11.3 hours |
| June | 27.3 °C25.8° to 28.4° | 2.5 mm/day | 79.3% | 6.9 m/s | 11.1 hours |
| July | 26.7 °C25.2° to 27.9° | 2.4 mm/day | 79.6% | 6.9 m/s | 11.2 hours |
| August | 26.5 °C25° to 27.7° | 1.8 mm/day | 79.5% | 6.7 m/s | 11.5 hours |
| September | 26.7 °C25.2° to 27.8° | 3 mm/day | 79.9% | 6.9 m/s | 11.9 hours |
| October | 27 °C25.6° to 28.1° | 4.4 mm/day | 80.8% | 6.3 m/s | 12.4 hours |
| November | 27.4 °C25.8° to 28.6° | 6.5 mm/day | 81.5% | 5.6 m/s | 12.7 hours |
| December | 27.7 °C26.2° to 29° | 7.3 mm/day | 81.1% | 5.5 m/s | 12.9 hours |
See two months side by side and how much they differ. Both use the same 1991–2020 climate normals and NASA POWER data point as the table above, so they show typical conditions, not a forecast.
Comparing long term monthly averages for temperature, precipitation, wind, humidity, and daylight duration.
Interactive climate map
Open the climate map to compare monthly temperature, precipitation, and other averages.
Analyze monthly temperature, precipitation, and regional atmospheric patterns across diverse protected landscapes





Deepen your understanding of Rose Atoll Marine National Monument by examining its precise protected boundaries and its place within the geography of American Samoa. This route provides structured data for appreciating the monument's marine protected area status and its mapped natural context. Continue your atlas exploration to grasp the full geographic significance of this protected landscape.