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Arno, Marshall Islands climate
Af Tropical rainforest
Arno has a remarkably steady tropical climate (Tropical rainforest, Köppen Af). The hottest month is August with an average daily high near 31°C, while the coldest is December averaging around 24°C at night. Precipitation is fairly even year-round, totalling about 3303 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)Arno climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 30 | 30 | 31 | 31 | 31 | 31 | 31 | 30 |
| Avg temp (°C) | 27 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 28 | 27 | 27 | 27 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 24 | 24 |
| Precipitation (mm) | 186 | 174 | 211 | 309 | 250 | 299 | 307 | 264 | 326 | 345 | 327 | 303 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 30 | 30 | 30 | 30 | 30 | 30 |
| Avg temp (°C) | 27 | 27 | 28 | 28 | 27 | 28 |
| Avg low (°C) | 25 | 25 | 25 | 25 | 25 | 25 |
| Precipitation (mm) | 186 | 174 | 211 | 309 | 250 | 299 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 31 | 31 | 31 | 31 | 30 |
| Avg temp (°C) | 28 | 28 | 28 | 27 | 27 | 27 |
| Avg low (°C) | 25 | 25 | 25 | 24 | 24 | 24 |
| Precipitation (mm) | 307 | 264 | 326 | 345 | 327 | 303 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 11 | 12 | 13 | 10 | 12 | 12 | 14 | 14 | 13 | 12 | 12 |
| Days with high ≥ 32°C (days) | 0.5 | 1 | 3 | 2 | 0.9 | 1 | 2 | 4 | 4 | 3 | 2 | 1 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 9 | 11 | 12 | 13 | 10 | 12 |
| Days with high ≥ 32°C (days) | 0.5 | 1 | 3 | 2 | 0.9 | 1 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 12 | 14 | 14 | 13 | 12 | 12 |
| Days with high ≥ 32°C (days) | 2 | 4 | 4 | 3 | 2 | 1 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 74 | 72 | 74 | 73 | 73 | 74 | 73 | 75 | 77 | 77 | 76 |
| Relative humidity (%) | 79 | 79 | 80 | 81 | 83 | 83 | 82 | 82 | 81 | 81 | 81 | 81 |
| Wind speed (mph) | 15.3 | 15.4 | 15.0 | 14.5 | 13.1 | 12.2 | 10.3 | 8.5 | 8.5 | 8.7 | 10.7 | 14.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 76 | 74 | 72 | 74 | 73 | 73 |
| Relative humidity (%) | 79 | 79 | 80 | 81 | 83 | 83 |
| Wind speed (mph) | 15.3 | 15.4 | 15.0 | 14.5 | 13.1 | 12.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 74 | 73 | 75 | 77 | 77 | 76 |
| Relative humidity (%) | 82 | 82 | 81 | 81 | 81 | 81 |
| Wind speed (mph) | 10.3 | 8.5 | 8.5 | 8.7 | 10.7 | 14.2 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 14 years of daily observations at Arno, a weather station, inside the city. The underlying daily records come from NOAA's global station network.
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.