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Weather & Climate in Half Tree Hollow, Saint Helena
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Half Tree Hollow enjoys a temperate climate with an average annual temperature of 69°F (20°C). Winters average 74°F in January while summers reach 66°F in July / relatively mild seasonal variation. The area gets 364 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 7.4 inches (drier than the 38-inch national average). The city sits at an elevation of 1,184 feet.
Temperature
74°F Jan (23°C)
66°F Jul (19°C)
| Annual Average | 68.8°F |
| 27% above US avg | |
| January Average | 74°F (23°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 364 days/yr |
Geography
| Elevation | 1,184 ft (361 m) |
| Area | 0.6 sq mi (1.6 km²) |
| Population Density | 1,668/sq mi |
| Coordinates | -15.9372°N, 5.7200°W |
| Timezone | Atlantic/St_Helena |
Precipitation & Snow
Air Quality
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Sep 7, 2010 | 87 km NE of Jamestown, Saint Helena | M4.5 | 88 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 74°F (23°C) | 0.4 in | Warmest |
| February | 72°F (22°C) | 0.4 in | |
| March | 72°F (22°C) | 0.9 in | |
| April | 71°F (22°C) | 1.5 in | Wettest |
| May | 69°F (21°C) | 0.7 in | |
| June | 67°F (19°C) | 0.8 in | |
| July | 66°F (19°C) | 0.6 in | Coldest |
| August | 66°F (19°C) | 0.6 in | |
| September | 66°F (19°C) | 0.5 in | |
| October | 67°F (20°C) | 0.4 in | |
| November | 68°F (20°C) | 0.3 in | Driest |
| December | 70°F (21°C) | 0.4 in |
Half Tree Hollow has a seasonal temperature swing of 8°F / from 66°F in July to 74°F in January. Total annual precipitation is 7.5 inches, with April being the wettest month (1.5") and November the driest (0.3").