Waterloo, CA
Full City Profile · California · Sacramento County County
4.3
/5.0
A
Great
886
Population
163/sq mi density
$250,001
Median Income
$77,008 per capita
$883,200
Home Value
$727,596 Zillow
$1,908
Median Rent
14.8% income on rent
63°F
Avg Temperature
A
Overall
4.3 / 5.0
Strong
A+
Economy
5.0 / 5.0
$250,001 median income, 0.0% unemployment
A+
Affordability
4.7 / 5.0
$883,200 home value, $1,908/mo rent
B
Education
3.2 / 5.0
27.3% bachelor's degree or higher
Waterloo enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 48°F in January while summers reach 78°F in July. Annual precipitation totals 13.4 inches. The area receives 0.0 inches of snow annually. Air quality is rated Moderate with a median AQI of 51.
Temperature
48°F Jan (9°C)
78°F Jul (26°C)
| Annual Average | 63.0°F |
| 17% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 78°F (26°C) |
Geography
| Elevation | 58 ft (18 m) |
| Area | 5.4 sq mi (14.1 km²) |
| Population Density | 163/sq mi |
| Coordinates | 38.0365°N, 121.1846°W |
| Timezone | America/Los_Angeles |
| County | Sacramento County County |
| Nearest Airport | Sacramento International (SMF) 51 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 51.0 |
| Rating | Moderate |
| Good Days % | 49.7% |
| Unhealthy Days | 15 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0409 ppm |
| NO₂ (Nitrogen Dioxide) | 8.1 ppb |
| SO₂ (Sulfur Dioxide) | 0.17 ppb |
| CO (Carbon Monoxide) | 0.47 ppm |
| PM2.5 (Fine Particles) | 7.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.1 / 100 |
| Social Vulnerability | 37.4 / 100 |
| Community Resilience | 57.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | 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 | 89 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 127 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | - | 115 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | - | 121 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | - | - | 112 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
4 volcanoes 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 |
| Mono Lake Volcanic Field | Pyroclastic cone(s) | 2,121 m (6,959 ft) | 1790 | 189 km |
| Mono-Inyo Craters | Lava dome(s) | 2,796 m (9,173 ft) | 1380 | 191 km |
| Mammoth Mountain | Lava dome(s) | 3,369 m (11,053 ft) | 1260 | 194 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 2.7 in | Wettest |
| February | 52°F (11°C) | 2.5 in | |
| March | 56°F (14°C) | 1.9 in | |
| April | 61°F (16°C) | 1.1 in | |
| May | 68°F (20°C) | 0.6 in | |
| June | 74°F (23°C) | 0.1 in | |
| July | 78°F (26°C) | 0.0 in | Warmest, Driest |
| August | 77°F (25°C) | 0.0 in | |
| September | 74°F (23°C) | 0.1 in | |
| October | 66°F (19°C) | 0.7 in | |
| November | 55°F (13°C) | 1.4 in | |
| December | 48°F (9°C) | 2.4 in | Coldest |
Waterloo has a seasonal temperature swing of 30°F / from 48°F in December to 78°F in July. Total annual precipitation is 13.5 inches, with January being the wettest month (2.7") and July the driest (0.0").