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Marissa, IL
Full City Profile · Illinois · Randolph County County
2.6
/5.0
C+
Fair
1,133
Population
157/sq mi density
$48,393
Median Income
$29,798 per capita
$87,000
Home Value
$113,790 Zillow
$572
Median Rent
41.8% income on rent
55°F
Avg Temperature
293 sunny days/yr
719
Violent Crime/100K
2,435 property/100K
C+
Overall
2.6 / 5.0
Fair overall score based on economy, affordability, safety and education
C
Economy
2.4 / 5.0
$48,393 median income, 12.1% unemployment
A+
Affordability
5.0 / 5.0
$87,000 home value, $572/mo rent
F
Safety
1.0 / 5.0
719 violent crimes/100K (89% above avg)
C
Education
2.1 / 5.0
13.2% bachelor's degree or higher
Marissa experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 31°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 45.6 inches. The area receives 10.6 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
31°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 55.1°F |
| 2% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 421 ft (128 m) |
| Area | 7.2 sq mi (18.7 km²) |
| Population Density | 157/sq mi |
| Coordinates | 38.2497°N, 89.7714°W |
| Timezone | America/Chicago |
| County | Randolph County County |
| Nearest Airport | Farmington Regional (FAM) 46 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0498 ppm |
| PM2.5 (Fine Particles) | 7.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.6 / 100 |
| Social Vulnerability | 55.8 / 100 |
| Community Resilience | 80.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.2 in | Coldest, Driest |
| February | 35°F (1°C) | 2.5 in | |
| March | 45°F (7°C) | 3.8 in | |
| April | 55°F (13°C) | 3.9 in | |
| May | 65°F (18°C) | 4.3 in | Wettest |
| June | 74°F (23°C) | 3.7 in | |
| July | 77°F (25°C) | 3.9 in | Warmest |
| August | 76°F (25°C) | 3.2 in | |
| September | 69°F (21°C) | 3.3 in | |
| October | 58°F (14°C) | 3.0 in | |
| November | 46°F (8°C) | 3.6 in | |
| December | 35°F (2°C) | 3.1 in |
Marissa has a seasonal temperature swing of 46°F / from 31°F in January to 77°F in July. Total annual precipitation is 40.4 inches, with May being the wettest month (4.3") and January the driest (2.2").