Mendon, IL
Full City Profile · Illinois · Hancock County County
3.5
/5.0
B+
Good
1,131
Population
1,315/sq mi density
$62,778
Median Income
$26,427 per capita
$108,500
Home Value
$210,718 Zillow
$661
Median Rent
28.6% income on rent
53°F
Avg Temperature
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.6 / 5.0
$62,778 median income, 5.0% unemployment
A+
Affordability
5.0 / 5.0
$108,500 home value, $661/mo rent
D
Education
2.0 / 5.0
12.3% bachelor's degree or higher
Mendon experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 27°F in January while summers reach 76°F in July. Annual precipitation totals 36.4 inches. The area receives 17.0 inches of snow annually.
Temperature
27°F Jan (-3°C)
76°F Jul (25°C)
| Annual Average | 53.0°F |
| 2% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 76°F (25°C) |
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
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 | 27°F (-3°C) | 1.6 in | Coldest, Driest |
| February | 31°F (-0°C) | 1.8 in | |
| March | 42°F (6°C) | 2.3 in | |
| April | 53°F (12°C) | 4.0 in | |
| May | 64°F (18°C) | 4.6 in | Wettest |
| June | 73°F (23°C) | 4.5 in | |
| July | 76°F (25°C) | 3.5 in | Warmest |
| August | 75°F (24°C) | 3.9 in | |
| September | 67°F (19°C) | 3.1 in | |
| October | 55°F (13°C) | 3.1 in | |
| November | 42°F (6°C) | 2.4 in | |
| December | 32°F (-0°C) | 1.8 in |
Mendon has a seasonal temperature swing of 50°F / from 27°F in January to 76°F in July. Total annual precipitation is 36.4 inches, with May being the wettest month (4.6") and January the driest (1.6").