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Symerton, IL
Full City Profile · Illinois · Grundy County County
3.3
/5.0
B
Good
113
Population
706/sq mi density
$100,500
Median Income
$50,210 per capita
$208,300
Home Value
$312,850 Zillow
51°F
Avg Temperature
275 sunny days/yr
309
Violent Crime/100K
707 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$100,500 median income, 2.3% unemployment
A+
Affordability
5.0 / 5.0
$208,300 home value, /mo rent
F
Safety
1.0 / 5.0
309 violent crimes/100K
C
Education
2.2 / 5.0
15.1% bachelor's degree or higher
Symerton experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 24°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.2 inches. The area receives 18.4 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
24°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 639 ft (195 m) |
| Area | 0.0 sq mi (0.1 km²) |
| Population Density | 706/sq mi |
| Coordinates | 41.3256°N, 88.0531°W |
| Timezone | America/Chicago |
| County | Grundy County County |
| Nearest Airport | Joliet Regional (JOT) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 66.5 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 99.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1954 | MICHIGAN CITY, IN (LAKE MICHIGAN) | Avalanche | 3.0 m | 7 | 106 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 1.5 in | Coldest |
| February | 27°F (-3°C) | 1.4 in | Driest |
| March | 38°F (3°C) | 2.8 in | |
| April | 49°F (10°C) | 3.8 in | |
| May | 61°F (16°C) | 4.0 in | |
| June | 70°F (21°C) | 4.1 in | Wettest |
| July | 75°F (24°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 3.5 in | |
| September | 65°F (18°C) | 3.6 in | |
| October | 53°F (12°C) | 2.7 in | |
| November | 40°F (5°C) | 3.0 in | |
| December | 28°F (-2°C) | 2.5 in |
Symerton has a seasonal temperature swing of 51°F / from 24°F in January to 75°F in July. Total annual precipitation is 36.9 inches, with June being the wettest month (4.1") and February the driest (1.4").