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Edinburgh of the Seven Seas, Saint Helena climate
Cfb Oceanic / temperate
Edinburgh of the Seven Seas has a mildly seasonal mild-temperate climate (Oceanic / temperate, Köppen Cfb). The hottest month is February with an average daily high near 19°C, while the coldest is September averaging around 11°C at night. Around 1324 mm of precipitation falls each year, peaking in June (152 mm) and easing off in February (72 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)Edinburgh of the Seven Seas climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 19 | 19 | 18 | 16 | 15 | 14 | 13 | 13 | 14 | 15 | 17 |
| Avg temp (°C) | 17 | 18 | 18 | 17 | 15 | 14 | 13 | 12 | 12 | 13 | 14 | 16 |
| Avg low (°C) | 16 | 17 | 17 | 16 | 14 | 13 | 12 | 11 | 11 | 12 | 13 | 15 |
| Precipitation (mm) | 89 | 72 | 103 | 126 | 140 | 152 | 125 | 100 | 113 | 110 | 94 | 100 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 18 | 19 | 19 | 18 | 16 | 15 |
| Avg temp (°C) | 17 | 18 | 18 | 17 | 15 | 14 |
| Avg low (°C) | 16 | 17 | 17 | 16 | 14 | 13 |
| Precipitation (mm) | 89 | 72 | 103 | 126 | 140 | 152 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 14 | 13 | 13 | 14 | 15 | 17 |
| Avg temp (°C) | 13 | 12 | 12 | 13 | 14 | 16 |
| Avg low (°C) | 12 | 11 | 11 | 12 | 13 | 15 |
| Precipitation (mm) | 125 | 100 | 113 | 110 | 94 | 100 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 78 | 80 | 81 | 83 | 84 | 83 | 85 | 84 | 82 | 81 | 79 |
| Relative humidity (%) | 84 | 83 | 82 | 82 | 81 | 81 | 82 | 81 | 81 | 82 | 83 | 84 |
| Wind speed (mph) | 12.4 | 12.3 | 12.9 | 14.1 | 16.1 | 16.8 | 16.9 | 16.8 | 15.7 | 14.2 | 13.5 | 13.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 78 | 78 | 80 | 81 | 83 | 84 |
| Relative humidity (%) | 84 | 83 | 82 | 82 | 81 | 81 |
| Wind speed (mph) | 12.4 | 12.3 | 12.9 | 14.1 | 16.1 | 16.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 83 | 85 | 84 | 82 | 81 | 79 |
| Relative humidity (%) | 82 | 81 | 81 | 82 | 83 | 84 |
| Wind speed (mph) | 16.9 | 16.8 | 15.7 | 14.2 | 13.5 | 13.0 |
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.