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Marseilles, IL
Full City Profile · Illinois · LaSalle County County
3.0
/5.0
B
Good
4,071
Population
450/sq mi density
$56,777
Median Income
$31,391 per capita
$119,100
Home Value
$200,013 Zillow
$1,039
Median Rent
26.2% income on rent
50°F
Avg Temperature
275 sunny days/yr
206
Violent Crime/100K
1,032 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.5 / 5.0
$56,777 median income, 3.6% unemployment
A+
Affordability
5.0 / 5.0
$119,100 home value, $1,039/mo rent
F
Safety
1.0 / 5.0
206 violent crimes/100K
C+
Education
2.7 / 5.0
21.2% bachelor's degree or higher
Marseilles experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 23°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.0 inches. The area receives 25.0 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
23°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.7°F |
| 8% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 679 ft (207 m) |
| Area | 9.2 sq mi (23.9 km²) |
| Population Density | 450/sq mi |
| Coordinates | 41.2822°N, 88.6814°W |
| Timezone | America/Chicago |
| County | LaSalle County County |
| Nearest Airport | Illinois Valley Regional-Walter A Duncan Field (VYS) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 86.1 / 100 |
| Social Vulnerability | 38.9 / 100 |
| Community Resilience | 90.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.5 in | Coldest |
| February | 27°F (-3°C) | 1.4 in | Driest |
| March | 38°F (3°C) | 2.7 in | |
| April | 50°F (10°C) | 3.7 in | |
| May | 61°F (16°C) | 3.9 in | |
| June | 70°F (21°C) | 4.0 in | Wettest |
| July | 73°F (23°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 (4°C) | 2.9 in | |
| December | 27°F (-3°C) | 2.4 in |
Marseilles has a seasonal temperature swing of 50°F / from 23°F in January to 73°F in July. Total annual precipitation is 36.2 inches, with June being the wettest month (4.0") and February the driest (1.4").