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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 30°C, while the coldest is September averaging around 22°C at night. Precipitation totals about 178 mm a year and is strongly seasonal — April alone averages 30 mm while January barely receives 5 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)Georgetown climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 30 | 30 | 30 | 28 | 28 | 27 | 27 | 27 | 27 | 28 |
| Avg temp (°C) | 26 | 27 | 28 | 28 | 27 | 26 | 25 | 24 | 24 | 24 | 25 | 25 |
| Avg low (°C) | 23 | 24 | 25 | 25 | 25 | 24 | 23 | 22 | 22 | 22 | 22 | 23 |
| Precipitation (mm) | 5 | 28 | 23 | 30 | 10 | 13 | 21 | 16 | 9 | 7 | 11 | 6 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 29 | 30 | 30 | 30 | 30 | 28 |
| Avg temp (°C) | 26 | 27 | 28 | 28 | 27 | 26 |
| Avg low (°C) | 23 | 24 | 25 | 25 | 25 | 24 |
| Precipitation (mm) | 5 | 28 | 23 | 30 | 10 | 13 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 28 | 27 | 27 | 27 | 27 | 28 |
| Avg temp (°C) | 25 | 24 | 24 | 24 | 25 | 25 |
| Avg low (°C) | 23 | 22 | 22 | 22 | 22 | 23 |
| Precipitation (mm) | 21 | 16 | 9 | 7 | 11 | 6 |
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 ≥ 32°C (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 ≥ 32°C (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 ≥ 32°C (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 (m/s) | 5.2 | 5.2 | 5.5 | 5.9 | 6.0 | 6.2 | 6.3 | 6.4 | 6.2 | 6.1 | 6.0 | 5.7 |
| 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 (m/s) | 5.2 | 5.2 | 5.5 | 5.9 | 6.0 | 6.2 |
| 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 (m/s) | 6.3 | 6.4 | 6.2 | 6.1 | 6.0 | 5.7 |
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.