Post Mountain, CA
Full City Profile · California · Trinity County County
5.0
/5.0
A+
Excellent
93
Population
7/sq mi density
57°F
Avg Temperature
A+
Overall
5.0 / 5.0
Strong
A+
Education
5.0 / 5.0
100.0% bachelor's degree or higher
Post Mountain enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 42°F in January while summers reach 75°F in July. Annual precipitation totals 35.8 inches. The area receives 2.7 inches of snow annually. Air quality is rated Good with a median AQI of 31.
Temperature
42°F Jan (6°C)
75°F Jul (24°C)
| Annual Average | 56.8°F |
| 5% above US avg | |
| January Average | 42°F (6°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 3,395 ft (1,035 m) |
| Area | 12.4 sq mi (32.1 km²) |
| Population Density | 7/sq mi |
| Coordinates | 40.4159°N, 123.2316°W |
| Timezone | America/Los_Angeles |
| County | Trinity County County |
| Nearest Airport | Redding Regional (RDD) 49 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
1 tsunami 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 | - | 92 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
4 volcanoes within 200 km. Closest: Shasta (141 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Shasta | Stratovolcano | 4,317 m (14,163 ft) | 1250 | 141 km |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 146 km |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 166 km |
| Medicine Lake | Shield | 2,412 m (7,913 ft) | 1060 | 194 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 42°F (6°C) | 6.4 in | |
| February | 45°F (7°C) | 5.4 in | |
| March | 50°F (10°C) | 4.6 in | |
| April | 54°F (12°C) | 2.6 in | |
| May | 61°F (16°C) | 1.7 in | |
| June | 67°F (20°C) | 0.7 in | |
| July | 75°F (24°C) | 0.2 in | Warmest, Driest |
| August | 74°F (23°C) | 0.2 in | |
| September | 68°F (20°C) | 0.4 in | |
| October | 58°F (14°C) | 2.2 in | |
| November | 47°F (8°C) | 4.2 in | |
| December | 41°F (5°C) | 7.2 in | Coldest, Wettest |
Post Mountain has a seasonal temperature swing of 34°F / from 41°F in December to 75°F in July. Total annual precipitation is 35.8 inches, with December being the wettest month (7.2") and July the driest (0.2").