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Rio Dell, CA
Full City Profile · California · Humboldt County County
2.1
/5.0
C
Fair
3,371
Population
1,359/sq mi density
$46,055
Median Income
$24,427 per capita
$313,400
Home Value
$304,507 Zillow
$1,057
Median Rent
37.7% income on rent
56°F
Avg Temperature
275 sunny days/yr
324
Violent Crime/100K
1,798 property/100K
C
Overall
2.1 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.0 / 5.0
$46,055 median income, 6.7% unemployment
C+
Affordability
2.8 / 5.0
$313,400 home value, $1,057/mo rent
F
Safety
1.0 / 5.0
324 violent crimes/100K
D
Education
1.8 / 5.0
9.6% bachelor's degree or higher
Rio Dell enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 50°F in January while summers reach 62°F in July. The area gets 275 sunny days per year. Annual precipitation totals 47.7 inches. Air quality is rated Good with a median AQI of 48.
Temperature
50°F Jan (10°C)
62°F Jul (17°C)
| Annual Average | 55.6°F |
| 3% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 62°F (17°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 648 ft (198 m) |
| Area | 2.5 sq mi (6.4 km²) |
| Population Density | 1,359/sq mi |
| Coordinates | 40.4956°N, 124.1152°W |
| Timezone | America/Los_Angeles |
| County | Humboldt County County |
| Nearest Airport | Redding Regional (RDD) 95 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0303 ppm |
| NO₂ (Nitrogen Dioxide) | 3.1 ppb |
| SO₂ (Sulfur Dioxide) | 0.31 ppb |
| CO (Carbon Monoxide) | 0.23 ppm |
| PM2.5 (Fine Particles) | 10.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.8 / 100 |
| Social Vulnerability | 74.7 / 100 |
| Community Resilience | 56.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively High |
| Volcano | No Rating |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 1.8 m (6 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1992 | CAPE MENDOCINO, N. CALIFORNIA | Earthquake | 1.8 m | — | 22 km |
| 2024 | CAPE MENDOCINO, N. CALIFORNIA | Earthquake | 0.1 m | — | 78 km |
| 1994 | N. CALIFORNIA | Earthquake | 0.1 m | — | 133 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Shasta (191 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shasta | Stratovolcano | 4,317 m (14,163 ft) | 1250 | 191 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 11.5 in | |
| February | 46°F (8°C) | 9.7 in | |
| March | 46°F (8°C) | 9.4 in | |
| April | 48°F (9°C) | 4.9 in | |
| May | 52°F (11°C) | 1.9 in | |
| June | 57°F (14°C) | 0.6 in | |
| July | 62°F (17°C) | 0.2 in | Driest |
| August | 62°F (17°C) | 0.7 in | Warmest |
| September | 61°F (16°C) | 1.3 in | |
| October | 55°F (13°C) | 4.5 in | |
| November | 48°F (9°C) | 11.2 in | |
| December | 44°F (7°C) | 12.1 in | Coldest, Wettest |
Rio Dell has a seasonal temperature swing of 18°F / from 44°F in December to 62°F in August. Total annual precipitation is 67.8 inches, with December being the wettest month (12.1") and July the driest (0.2").