Lake Cassidy, WA
Full City Profile · Washington · Island County County
3.8
/5.0
B+
Good
3,337
Population
315/sq mi density
$115,417
Median Income
$49,553 per capita
$683,600
Home Value
$700,644 Zillow
$2,000
Median Rent
23.4% income on rent
52°F
Avg Temperature
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$115,417 median income, 1.0% unemployment
B
Affordability
3.3 / 5.0
$683,600 home value, $2,000/mo rent
B
Education
3.2 / 5.0
27.0% bachelor's degree or higher
Lake Cassidy experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 41°F in January while summers reach 65°F in July. Annual precipitation totals 40.2 inches. The area receives 4.3 inches of snow annually.
Temperature
41°F Jan (5°C)
65°F Jul (18°C)
| Annual Average | 52.1°F |
| 4% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 65°F (18°C) |
Geography
| Elevation | 387 ft (118 m) |
| Area | 10.6 sq mi (27.4 km²) |
| Population Density | 315/sq mi |
| Coordinates | 48.0660°N, 122.0824°W |
| Timezone | America/Los_Angeles |
| County | Island County County |
| Nearest Airport | Seattle Paine Field International (PAE) 15 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.0 / 100 |
| Social Vulnerability | 36.8 / 100 |
| Community Resilience | 80.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| Volcano | Relatively 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: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 91 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | - | 106 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | - | 92 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | - | 8 | 108 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | - | - | 21 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Glacier Peak (72 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 72 km |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 82 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 137 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 5.0 in | |
| February | 43°F (6°C) | 3.7 in | |
| March | 46°F (8°C) | 4.1 in | |
| April | 51°F (10°C) | 3.4 in | |
| May | 56°F (14°C) | 2.7 in | |
| June | 61°F (16°C) | 2.3 in | |
| July | 65°F (18°C) | 1.0 in | Driest |
| August | 65°F (19°C) | 1.2 in | Warmest |
| September | 60°F (16°C) | 2.3 in | |
| October | 52°F (11°C) | 3.7 in | |
| November | 45°F (7°C) | 5.8 in | Wettest |
| December | 40°F (5°C) | 5.0 in | Coldest |
Lake Cassidy has a seasonal temperature swing of 25°F / from 40°F in December to 65°F in August. Total annual precipitation is 40.3 inches, with November being the wettest month (5.8") and July the driest (1.0").