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Georgetown, Saint Helena climate
BWh Hot desert
Georgetown has a remarkably steady tropical climate (Hot desert, Köppen BWh). The hottest month is April with an average daily high near 86°F, while the coldest is September averaging around 71°F at night. Precipitation totals about 7 inches a year and is strongly seasonal — April alone averages 1.2 inches while January barely receives 0.18 inches.
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)Georgetown climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 86 | 87 | 86 | 85 | 83 | 82 | 80 | 80 | 81 | 81 | 83 |
| Avg temp (°F) | 79 | 81 | 82 | 82 | 81 | 79 | 77 | 76 | 75 | 76 | 76 | 78 |
| Avg low (°F) | 74 | 76 | 77 | 77 | 77 | 75 | 73 | 71 | 71 | 71 | 72 | 73 |
| Precipitation (in) | 0.2 | 1.1 | 0.9 | 1.2 | 0.4 | 0.5 | 0.8 | 0.6 | 0.4 | 0.3 | 0.4 | 0.2 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 84 | 86 | 87 | 86 | 85 | 83 |
| Avg temp (°F) | 79 | 81 | 82 | 82 | 81 | 79 |
| Avg low (°F) | 74 | 76 | 77 | 77 | 77 | 75 |
| Precipitation (in) | 0.2 | 1.1 | 0.9 | 1.2 | 0.4 | 0.5 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 82 | 80 | 80 | 81 | 81 | 83 |
| Avg temp (°F) | 77 | 76 | 75 | 76 | 76 | 78 |
| Avg low (°F) | 73 | 71 | 71 | 71 | 72 | 73 |
| Precipitation (in) | 0.8 | 0.6 | 0.4 | 0.3 | 0.4 | 0.2 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 3 | 5 | 4 | 2 | 3 | 5 | 6 | 4 | 4 | 5 | 3 |
| Days with high ≥ 90°F (days) | — | — | 0.1 | 0.1 | — | — | — | — | — | — | — | — |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 2 | 3 | 5 | 4 | 2 | 3 |
| Days with high ≥ 90°F (days) | — | — | 0.1 | 0.1 | — | — |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 5 | 6 | 4 | 4 | 5 | 3 |
| Days with high ≥ 90°F (days) | — | — | — | — | — | — |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 34 | 36 | 44 | 42 | 41 | 45 | 58 | 65 | 69 | 67 | 55 |
| Relative humidity (%) | 78 | 78 | 77 | 77 | 76 | 74 | 74 | 76 | 78 | 79 | 79 | 78 |
| Wind speed (mph) | 11.7 | 11.7 | 12.2 | 13.2 | 13.5 | 13.9 | 14.1 | 14.2 | 13.9 | 13.6 | 13.5 | 12.6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 42 | 34 | 36 | 44 | 42 | 41 |
| Relative humidity (%) | 78 | 78 | 77 | 77 | 76 | 74 |
| Wind speed (mph) | 11.7 | 11.7 | 12.2 | 13.2 | 13.5 | 13.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 45 | 58 | 65 | 69 | 67 | 55 |
| Relative humidity (%) | 74 | 76 | 78 | 79 | 79 | 78 |
| Wind speed (mph) | 14.1 | 14.2 | 13.9 | 13.6 | 13.5 | 12.6 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 10 years of daily observations at Wide Awake Field (A, a weather station, about 4 km from the city centre. 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.