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Fern Forest, HI
Full City Profile · Hawaii · Hawaii County County
2.6
/5.0
C+
Fair
880
Population
71/sq mi density
$33,173
Median Income
$35,618 per capita
$173,800
Home Value
$327,896 Zillow
62°F
Avg Temperature
330 sunny days/yr
1,821
Violent Crime/100K
1,945 property/100K
C+
Overall
2.6 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.0 / 5.0
$33,173 median income, 0.0% unemployment
B+
Affordability
3.7 / 5.0
$173,800 home value, /mo rent
F
Safety
1.0 / 5.0
1,821 violent crimes/100K (379% above avg)
C+
Education
2.5 / 5.0
18.8% bachelor's degree or higher
Fern Forest enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 59°F in January while summers reach 64°F in July. The area gets 330 sunny days per year. Annual precipitation totals 96.2 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 24.
Temperature
59°F Jan (15°C)
64°F Jul (18°C)
| Annual Average | 61.7°F |
| 14% above US avg | |
| January Average | 59°F (15°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 2,260 ft (689 m) |
| Area | 12.5 sq mi (32.3 km²) |
| Population Density | 71/sq mi |
| Coordinates | 19.4647°N, 155.1324°W |
| Timezone | Pacific/Honolulu |
| County | Hawaii County County |
| Nearest Airport | Hilo International (ITO) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 24.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| SO₂ (Sulfur Dioxide) | 1.86 ppb |
| PM2.5 (Fine Particles) | 2.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.5 / 100 |
| Social Vulnerability | 56.8 / 100 |
| Community Resilience | 56.7 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively High |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | No Rating |
| Winter Weather | Very Low |
| Lightning | Very High |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Coastal Flood | Relatively Low |
| Tsunami | Relatively Moderate |
| Volcano | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
10 tsunamis recorded within 500 km. Highest wave on record: 14.3 m (47 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1975 | HAWAII | Eruption + Earthquake | 14.3 m | 2 | 11 km |
| 1868 | HAWAII | Earthquake | 13.7 m | 77 | 65 km |
| 1869 | OFF COAST OF HAWAII | Unknown | 8.2 m | — | 61 km |
| 1919 | ALIKA, HAWAII | Explosion | 4.3 m | — | 85 km |
| 1951 | HAWAII | Earthquake | 3.6 m | — | 91 km |
| 1952 | HAWAII | Earthquake | 3.0 m | — | 43 km |
| 1908 | HAWAII | Earthquake | 1.2 m | — | 54 km |
| 2018 | HAWAII | Eruption | 0.4 m | — | 21 km |
| 1989 | HAWAII | Eruption + Earthquake | 0.3 m | — | 13 km |
| 2006 | HAWAII | Earthquake | 0.1 m | — | 96 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Kilauea (17 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Kilauea | Shield | 1,222 m (4,009 ft) | 2018 | 17 km |
| Mauna Loa | Shield | 4,170 m (13,681 ft) | 1984 | 50 km |
| Mauna Kea | Shield | 4,205 m (13,796 ft) | -2460 | 53 km |
| Hualalai | Shield | 2,523 m (8,278 ft) | 1801 | 81 km |
| Haleakala | Shield | 3,055 m (10,023 ft) | 1750 | 181 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 59°F (15°C) | 13.0 in | Coldest |
| February | 66°F (19°C) | 10.9 in | |
| March | 66°F (19°C) | 6.5 in | |
| April | 66°F (19°C) | 9.2 in | |
| May | 67°F (20°C) | 7.0 in | |
| June | 68°F (20°C) | 4.3 in | Driest |
| July | 64°F (18°C) | 7.2 in | |
| August | 70°F (21°C) | 8.0 in | |
| September | 70°F (21°C) | 6.1 in | Warmest |
| October | 70°F (21°C) | 11.5 in | |
| November | 68°F (20°C) | 13.1 in | |
| December | 66°F (19°C) | 15.0 in | Wettest |
Fern Forest has a seasonal temperature swing of 12°F / from 59°F in January to 70°F in September. Total annual precipitation is 111.8 inches, with December being the wettest month (15.0") and June the driest (4.3").