Marissa, IL
Full City Profile · Illinois · Randolph County County
3.2
/5.0
B
Good
1,133
Population
157/sq mi density
$48,393
Median Income
$29,798 per capita
$87,000
Home Value
$114,909 Zillow
$572
Median Rent
41.8% income on rent
55°F
Avg Temperature
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
C
Economy
2.4 / 5.0
$48,393 median income, 20.0% unemployment
A+
Affordability
5.0 / 5.0
$87,000 home value, $572/mo rent
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. Annual precipitation totals 45.0 inches. The area receives 11.6 inches of snow annually. Air quality is rated Good with a median AQI of 40.
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) |
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 | 40.0 |
| Rating | Good |
| Good Days % | 79.0% |
| Unhealthy Days | 0 |
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) | 2.8 in | Coldest |
| February | 35°F (2°C) | 2.4 in | Driest |
| March | 44°F (7°C) | 3.6 in | |
| April | 55°F (13°C) | 4.9 in | |
| May | 65°F (18°C) | 4.9 in | |
| June | 73°F (23°C) | 5.2 in | Wettest |
| July | 77°F (25°C) | 4.8 in | Warmest |
| August | 75°F (24°C) | 3.3 in | |
| September | 68°F (20°C) | 3.4 in | |
| October | 57°F (14°C) | 3.0 in | |
| November | 45°F (7°C) | 3.8 in | |
| December | 35°F (2°C) | 2.9 in |
Marissa has a seasonal temperature swing of 46°F / from 31°F in January to 77°F in July. Total annual precipitation is 45.0 inches, with June being the wettest month (5.2") and February the driest (2.4").