Photo by Aaron Wilson on Unsplash
Jamestown, Saint Helena is a 637-resident city with 261 sunny days and 0 frost days annually and an annual PM2.5 of 3.0 µg/m³. The capital and largest city of Saint Helena.
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Dinner outside
Monthly climate metrics across temperature, precipitation, wind, and UV.
| Metric | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Temperature | |||||||||||||
| Daily high°C | 24 | 25 | 25 | 25 | 24 | 22 | 21 | 20 | 20 | 20 | 21 | 22 | 22 |
| Daily mean°C | 23 | 24 | 25 | 24 | 23 | 22 | 20 | 20 | 19 | 19 | 20 | 22 | 22 |
| Daily low°C | 23 | 24 | 24 | 23 | 22 | 21 | 20 | 19 | 19 | 19 | 20 | 21 | 21 |
| Thermal comfort | |||||||||||||
| High feelsDaily high feels-like°C | 26 | 26 | 26 | 25 | 24 | 23 | 19 | 19 | 18 | 19 | 21 | 23 | 22 |
| Mean feelsDaily mean feels-like°C | 23 | 23 | 24 | 23 | 21 | 17 | 15 | 15 | 15 | 16 | 18 | 19 | 19 |
| Low feelsDaily low feels-like°C | 17 | 18 | 19 | 17 | 15 | 12 | 10 | 9 | 9 | 10 | 12 | 13 | 13 |
| Humidity | |||||||||||||
| HumidityRelative humidity% | 78 | 75 | 73 | 73 | 71 | 70 | 72 | 73 | 76 | 78 | 77 | 79 | 74 |
| Dewpoint°C | 19.0 | 19.6 | 19.6 | 18.8 | 17.5 | 15.7 | 15.1 | 14.7 | 14.8 | 15.2 | 15.9 | 17.8 | 17.0 |
| Precipitation | |||||||||||||
| Rainfallmm | 14 | 14 | 15 | 12 | 17 | 13 | 15 | 14 | 13 | 10 | 9 | 12 | 158 |
| Rain days≥1mm | 2 | 2 | 5 | 2 | 4 | 5 | 3 | 2 | 0 | 0 | 0 | 0 | 25 |
| Wind | |||||||||||||
| Wind avgm/s | 6.4 | 6.7 | 6.7 | 6.8 | 7.4 | 7.5 | 8.5 | 8.0 | 8.7 | 7.7 | 7.1 | 7.2 | 7.4 |
| Wind gustsm/s | 8.7 | 9.0 | 8.9 | 9.3 | 10.1 | 11.3 | 11.9 | 10.8 | 11.0 | 10.9 | 9.1 | 9.6 | 10.0 |
| Sun & UV | |||||||||||||
| Sunshinehrs/day | 9.9 | 9.4 | 9.2 | 8.7 | 7.9 | 7.5 | 7.7 | 8.4 | 8.6 | 9.0 | 9.6 | 9.6 | 8.8 |
| Clear skyindex | 65% | 56% | 61% | 51% | 45% | 42% | 36% | 34% | 34% | 39% | 49% | 53% | 47% |
| UV indexmax avg | 12.2 | 12.1 | 10.9 | 9.1 | 7.3 | 6.3 | 5.8 | 6.5 | 7.3 | 9.1 | 10.7 | 11.2 | 9.0 |
Outdoor living in Jamestown is seasonal. July through October are the toughest stretch. Even dinner outside manages 1/12 months, while walking works 8/12 months.
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Air Quality
Jamestown reports an annual PM2.5 of 3.0 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.
Jamestown reports an annual PM2.5 of 3.0 µg/m³. That's below the WHO 2021 annual guideline of 5 µg/m³ — cleaner than most cities on the continent.