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Crystal Lake, CT
Full City Profile · Connecticut · Capitol Planning Region County
3.8
/5.0
B+
Good
1,963
Population
220/sq mi density
$142,642
Median Income
$58,355 per capita
$345,300
Home Value
$326,837 Zillow
47°F
Avg Temperature
271 sunny days/yr
191
Violent Crime/100K
2,716 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$142,642 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$345,300 home value, /mo rent
F
Safety
1.0 / 5.0
191 violent crimes/100K
A
Education
4.3 / 5.0
40.9% bachelor's degree or higher
Crystal Lake experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 24°F in January while summers reach 70°F in July. The area gets 271 sunny days per year. Annual precipitation totals 50.2 inches. Air quality is rated Good with a median AQI of 39.
Temperature
24°F Jan (-5°C)
70°F Jul (21°C)
| Annual Average | 47.1°F |
| 13% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 271 days/yr |
Geography
| Elevation | 657 ft (200 m) |
| Area | 8.9 sq mi (23.1 km²) |
| Population Density | 220/sq mi |
| Coordinates | 41.9330°N, 72.3813°W |
| Timezone | America/New_York |
| County | Capitol Planning Region County |
| Nearest Airport | Bradley International (BDL) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.4 / 100 |
| Social Vulnerability | 28.1 / 100 |
| Community Resilience | 64.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | — | 140 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 3.9 in | Coldest |
| February | 26°F (-3°C) | 3.4 in | Driest |
| March | 35°F (2°C) | 4.0 in | |
| April | 46°F (8°C) | 4.1 in | |
| May | 57°F (14°C) | 4.1 in | |
| June | 65°F (18°C) | 3.9 in | |
| July | 70°F (21°C) | 3.8 in | Warmest |
| August | 70°F (21°C) | 3.9 in | |
| September | 62°F (17°C) | 4.1 in | |
| October | 51°F (10°C) | 4.0 in | |
| November | 41°F (5°C) | 4.3 in | Wettest |
| December | 30°F (-1°C) | 4.1 in |
Crystal Lake has a seasonal temperature swing of 46°F / from 24°F in January to 70°F in July. Total annual precipitation is 47.6 inches, with November being the wettest month (4.3") and February the driest (3.4").