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Hennepin, IL
Full City Profile · Illinois · Putnam County County
3.3
/5.0
B
Good
790
Population
149/sq mi density
$78,594
Median Income
$39,049 per capita
$166,700
Home Value
$204,195 Zillow
$836
Median Rent
29.1% income on rent
51°F
Avg Temperature
275 sunny days/yr
171
Violent Crime/100K
627 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$78,594 median income, 3.3% unemployment
A+
Affordability
5.0 / 5.0
$166,700 home value, $836/mo rent
F
Safety
1.0 / 5.0
171 violent crimes/100K
C+
Education
2.9 / 5.0
24.1% bachelor's degree or higher
Hennepin experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 38.6 inches. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 51.4°F |
| 5% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 535 ft (163 m) |
| Area | 5.3 sq mi (13.8 km²) |
| Population Density | 149/sq mi |
| Coordinates | 41.2505°N, 89.3141°W |
| Timezone | America/Chicago |
| County | Putnam County County |
| Nearest Airport | Illinois Valley Regional-Walter A Duncan Field (VYS) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 9.2 / 100 |
| Social Vulnerability | 34.8 / 100 |
| Community Resilience | 79.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very 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 |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 38°F (3°C) | 2.6 in | |
| April | 50°F (10°C) | 3.6 in | |
| May | 61°F (16°C) | 3.7 in | |
| June | 70°F (21°C) | 4.0 in | Wettest |
| July | 75°F (24°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 3.8 in | |
| September | 65°F (18°C) | 3.9 in | |
| October | 53°F (12°C) | 2.6 in | |
| November | 40°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.1 in |
Hennepin has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 35.5 inches, with June being the wettest month (4.0") and February the driest (1.3").