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Grayson, CA
Full City Profile · California · Stanislaus County County
2.8
/5.0
C+
Fair
1,164
Population
6,467/sq mi density
$87,961
Median Income
$25,424 per capita
$439,300
Home Value
$504,391 Zillow
$1,690
Median Rent
31.9% income on rent
61°F
Avg Temperature
330 sunny days/yr
191
Violent Crime/100K
2,984 property/100K
C+
Overall
2.8 / 5.0
Fair overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$87,961 median income, 1.3% unemployment
B+
Affordability
3.9 / 5.0
$439,300 home value, $1,690/mo rent
F
Safety
1.0 / 5.0
191 violent crimes/100K
D
Education
1.7 / 5.0
8.9% bachelor's degree or higher
Grayson enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 47°F in January while summers reach 75°F in July. The area gets 330 sunny days per year. Annual precipitation totals 12.7 inches. Air quality is rated Good with a median AQI of 48.
Temperature
47°F Jan (8°C)
75°F Jul (24°C)
| Annual Average | 61.0°F |
| 13% above US avg | |
| January Average | 47°F (8°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 54 ft (16 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 6,467/sq mi |
| Coordinates | 37.5646°N, 121.1801°W |
| Timezone | America/Los_Angeles |
| County | Stanislaus County County |
| Nearest Airport | Merced Yosemite Regional (MCE) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0458 ppm |
| NO₂ (Nitrogen Dioxide) | 12.4 ppb |
| CO (Carbon Monoxide) | 0.22 ppm |
| PM2.5 (Fine Particles) | 10.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.9 / 100 |
| Social Vulnerability | 32.0 / 100 |
| Community Resilience | 33.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Drought | Very High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1868 | N. CALIFORNIA | Eruption + Earthquake | 4.5 m | 30 | 82 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 86 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 99 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 117 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 75 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Mammoth Mountain (189 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Mammoth Mountain | Lava dome(s) | 3,369 m (11,053 ft) | 1260 | 189 km |
| Mono-Inyo Craters | Lava dome(s) | 2,796 m (9,173 ft) | 1380 | 191 km |
| Mono Lake Volcanic Field | Pyroclastic cone(s) | 2,121 m (6,959 ft) | 1790 | 195 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (8°C) | 2.2 in | Wettest |
| February | 51°F (10°C) | 1.8 in | |
| March | 55°F (13°C) | 1.8 in | |
| April | 59°F (15°C) | 0.9 in | |
| May | 65°F (19°C) | 0.2 in | |
| June | 72°F (22°C) | 0.1 in | |
| July | 75°F (24°C) | 0.0 in | Driest |
| August | 76°F (24°C) | 0.1 in | Warmest |
| September | 72°F (22°C) | 0.3 in | |
| October | 66°F (19°C) | 0.7 in | |
| November | 55°F (13°C) | 1.9 in | |
| December | 46°F (8°C) | 1.7 in | Coldest |
Grayson has a seasonal temperature swing of 29°F / from 46°F in December to 76°F in August. Total annual precipitation is 11.7 inches, with January being the wettest month (2.2") and July the driest (0.0").