Symerton, IL
Full City Profile · Illinois · Grundy County County
4.0
/5.0
A
Great
113
Population
706/sq mi density
$100,500
Median Income
$50,210 per capita
$208,300
Home Value
$312,850 Zillow
50°F
Avg Temperature
A
Overall
4.0 / 5.0
Strong
A+
Economy
4.9 / 5.0
$100,500 median income, 3.0% unemployment
A+
Affordability
5.0 / 5.0
$208,300 home value, /mo rent
C
Education
2.2 / 5.0
15.1% bachelor's degree or higher
Symerton experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 24°F in January while summers reach 74°F in July. Annual precipitation totals 41.3 inches. The area receives 27.4 inches of snow annually.
Temperature
24°F Jan (-5°C)
74°F Jul (23°C)
| Annual Average | 50.4°F |
| 7% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 74°F (23°C) |
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
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 (-5°C) | 2.3 in | Coldest |
| February | 28°F (-2°C) | 2.2 in | Driest |
| March | 38°F (3°C) | 2.6 in | |
| April | 49°F (10°C) | 4.0 in | |
| May | 60°F (16°C) | 4.6 in | |
| June | 70°F (21°C) | 4.7 in | Wettest |
| July | 74°F (23°C) | 4.7 in | Warmest |
| August | 72°F (22°C) | 4.2 in | |
| September | 66°F (19°C) | 3.5 in | |
| October | 53°F (12°C) | 3.5 in | |
| November | 40°F (5°C) | 2.7 in | |
| December | 29°F (-1°C) | 2.4 in |
Symerton has a seasonal temperature swing of 50°F / from 24°F in January to 74°F in July. Total annual precipitation is 41.3 inches, with June being the wettest month (4.7") and February the driest (2.2").