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Mendon, IL
Full City Profile · Illinois · Hancock County County
2.9
/5.0
C+
Fair
1,131
Population
1,315/sq mi density
$62,778
Median Income
$26,427 per capita
$108,500
Home Value
$199,601 Zillow
$661
Median Rent
28.6% income on rent
52°F
Avg Temperature
282 sunny days/yr
464
Violent Crime/100K
3,327 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$62,778 median income, 3.5% unemployment
A+
Affordability
5.0 / 5.0
$108,500 home value, $661/mo rent
F
Safety
1.0 / 5.0
464 violent crimes/100K (22% above avg)
D
Education
2.0 / 5.0
12.3% bachelor's degree or higher
Mendon experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 25°F in January while summers reach 76°F in July. The area gets 282 sunny days per year. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
76°F Jul (24°C)
| Annual Average | 52.0°F |
| 4% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 282 days/yr |
Geography
| Elevation | 764 ft (233 m) |
| Area | 0.9 sq mi (2.2 km²) |
| Population Density | 1,315/sq mi |
| Coordinates | 40.0892°N, 91.2858°W |
| Timezone | America/Chicago |
| County | Hancock County County |
| Nearest Airport | Quincy Regional-Baldwin Field (UIN) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 31.1 / 100 |
| Social Vulnerability | 64.8 / 100 |
| Community Resilience | 61.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.4 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.4 in | |
| March | 41°F (5°C) | 3.0 in | |
| April | 53°F (12°C) | 3.7 in | |
| May | 63°F (17°C) | 4.5 in | |
| June | 72°F (22°C) | 3.8 in | |
| July | 76°F (24°C) | 4.6 in | Warmest, Wettest |
| August | 74°F (23°C) | 3.6 in | |
| September | 66°F (19°C) | 4.4 in | |
| October | 55°F (13°C) | 3.2 in | |
| November | 41°F (5°C) | 2.8 in | |
| December | 30°F (-1°C) | 2.2 in |
Mendon has a seasonal temperature swing of 51°F / from 25°F in January to 76°F in July. Total annual precipitation is 38.7 inches, with July being the wettest month (4.6") and January the driest (1.4").