Mad River, CA
Full City Profile · California · Trinity County County
1.9
/5.0
D
Poor
544
Population
15/sq mi density
$280,900
Home Value
$166,167 Zillow
53°F
Avg Temperature
D
Overall
1.9 / 5.0
Below average overall score based on economy, affordability, safety and education
D
Education
1.9 / 5.0
11.2% bachelor's degree or higher
Mad River experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 44°F in January while summers reach 63°F in July. Annual precipitation totals 70.3 inches. The area receives 0.7 inches of snow annually. Air quality is rated Good with a median AQI of 31.
Temperature
44°F Jan (7°C)
63°F Jul (17°C)
| Annual Average | 52.9°F |
| 2% below US avg | |
| January Average | 44°F (7°C) |
| July Average | 63°F (17°C) |
Geography
| Elevation | 2,774 ft (846 m) |
| Area | 34.7 sq mi (89.7 km²) |
| Population Density | 15/sq mi |
| Coordinates | 40.4325°N, 123.4921°W |
| Timezone | America/Los_Angeles |
| County | Trinity County County |
| Nearest Airport | Redding Regional (RDD) 63 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 31.0 |
| Rating | Good |
| Good Days % | 72.3% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 79.5 / 100 |
| Social Vulnerability | 82.6 / 100 |
| Community Resilience | 37.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively High |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Drought | No Rating |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 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 | - | 70 km |
| 2024 | CAPE MENDOCINO, N. CALIFORNIA | Earthquake | 0.1 m | - | 130 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Shasta (154 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shasta | Stratovolcano | 4,317 m (14,163 ft) | 1250 | 154 km |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 168 km |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 174 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 44°F (7°C) | 12.4 in | |
| February | 46°F (8°C) | 10.5 in | |
| March | 48°F (9°C) | 9.4 in | |
| April | 51°F (11°C) | 6.0 in | |
| May | 56°F (14°C) | 3.8 in | |
| June | 60°F (15°C) | 1.3 in | |
| July | 63°F (17°C) | 0.3 in | |
| August | 63°F (17°C) | 0.2 in | Warmest, Driest |
| September | 61°F (16°C) | 1.0 in | |
| October | 54°F (12°C) | 3.6 in | |
| November | 47°F (8°C) | 8.6 in | |
| December | 43°F (6°C) | 13.2 in | Coldest, Wettest |
Mad River has a seasonal temperature swing of 20°F / from 43°F in December to 63°F in August. Total annual precipitation is 70.3 inches, with December being the wettest month (13.2") and August the driest (0.2").