All Countries
Emerald Lake Hills, CA
Full City Profile · California · San Mateo County County
3.3
/5.0
B
Good
4,396
Population
3,725/sq mi density
$250,001
Median Income
$166,476 per capita
$2,000,001
Home Value
$2,825,154 Zillow
$3,501
Median Rent
17.0% income on rent
59°F
Avg Temperature
330 sunny days/yr
134
Violent Crime/100K
1,380 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$250,001 median income, 1.7% unemployment
C
Affordability
2.1 / 5.0
$2,000,001 home value, $3,501/mo rent
F
Safety
1.0 / 5.0
134 violent crimes/100K
A+
Education
5.0 / 5.0
75.6% bachelor's degree or higher
Emerald Lake Hills enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 50°F in January while summers reach 69°F in July. The area gets 330 sunny days per year. Annual precipitation totals 19.0 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
50°F Jan (10°C)
69°F Jul (20°C)
| Annual Average | 59.4°F |
| 10% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 335 ft (102 m) |
| Area | 1.2 sq mi (3.1 km²) |
| Population Density | 3,725/sq mi |
| Coordinates | 37.4657°N, 122.2654°W |
| Timezone | America/Los_Angeles |
| County | San Mateo County County |
| Nearest Airport | San Francisco International (SFO) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0332 ppm |
| NO₂ (Nitrogen Dioxide) | 12.1 ppb |
| CO (Carbon Monoxide) | 0.34 ppm |
| PM2.5 (Fine Particles) | 4.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.2 / 100 |
| Social Vulnerability | 20.5 / 100 |
| Community Resilience | 97.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Moderate |
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 | 30 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 59 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 5 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 33 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 44 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (173 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 173 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 5.4 in | Wettest |
| February | 51°F (11°C) | 4.4 in | |
| March | 52°F (11°C) | 4.3 in | |
| April | 55°F (13°C) | 1.9 in | |
| May | 58°F (15°C) | 0.5 in | |
| June | 62°F (17°C) | 0.2 in | |
| July | 69°F (20°C) | 0.1 in | Warmest, Driest |
| August | 66°F (19°C) | 0.1 in | |
| September | 65°F (18°C) | 0.4 in | |
| October | 61°F (16°C) | 1.5 in | |
| November | 54°F (12°C) | 3.9 in | |
| December | 49°F (9°C) | 4.3 in | Coldest |
Emerald Lake Hills has a seasonal temperature swing of 20°F / from 49°F in December to 69°F in July. Total annual precipitation is 26.9 inches, with January being the wettest month (5.4") and July the driest (0.1").