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Rongelap, Marshall Islands climate
Aw Tropical savanna (dry winter)
Rongelap has a remarkably steady tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is October with an average daily high near 28°C, while the coldest is February averaging around 27°C at night. Precipitation totals about 1043 mm a year and is strongly seasonal — October alone averages 166 mm while February barely receives 24 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Rongelap climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg temp (°C) | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 27 | 27 | 27 | 27 | 27 | 28 | 28 | 28 | 28 | 28 | 28 | 27 |
| Precipitation (mm) | 30 | 24 | 44 | 60 | 71 | 70 | 108 | 137 | 156 | 166 | 130 | 47 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 27 | 27 | 27 | 28 | 28 | 28 |
| Avg temp (°C) | 27 | 27 | 27 | 27 | 28 | 28 |
| Avg low (°C) | 27 | 27 | 27 | 27 | 27 | 28 |
| Precipitation (mm) | 30 | 24 | 44 | 60 | 71 | 70 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg temp (°C) | 28 | 28 | 28 | 28 | 28 | 28 |
| Avg low (°C) | 28 | 28 | 28 | 28 | 28 | 27 |
| Precipitation (mm) | 108 | 137 | 156 | 166 | 130 | 47 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 56 | 54 | 57 | 59 | 60 | 65 | 69 | 71 | 73 | 64 | 53 |
| Relative humidity (%) | 77 | 77 | 78 | 79 | 80 | 81 | 82 | 82 | 82 | 82 | 81 | 78 |
| Wind speed (km/h) | 25.3 | 25.3 | 25.1 | 24.8 | 22.9 | 21.9 | 19.5 | 16.5 | 15.7 | 17.4 | 22.1 | 26.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 57 | 56 | 54 | 57 | 59 | 60 |
| Relative humidity (%) | 77 | 77 | 78 | 79 | 80 | 81 |
| Wind speed (km/h) | 25.3 | 25.3 | 25.1 | 24.8 | 22.9 | 21.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 65 | 69 | 71 | 73 | 64 | 53 |
| Relative humidity (%) | 82 | 82 | 82 | 82 | 81 | 78 |
| Wind speed (km/h) | 19.5 | 16.5 | 15.7 | 17.4 | 22.1 | 26.0 |
Methodology & sources
Temperature & precipitation — modelled for this location from ERA5-Land reanalysis, a ~9 km global grid, because no long-record weather station is close enough to use.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.