Hennepin, IL
Full City Profile · Illinois · Putnam County County
4.0
/5.0
A
Great
790
Population
149/sq mi density
$78,594
Median Income
$39,049 per capita
$166,700
Home Value
$223,659 Zillow
$836
Median Rent
29.1% income on rent
51°F
Avg Temperature
A
Overall
4.0 / 5.0
Strong
A
Economy
4.1 / 5.0
$78,594 median income, 4.8% unemployment
A+
Affordability
5.0 / 5.0
$166,700 home value, $836/mo rent
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. Annual precipitation totals 38.6 inches. The area receives 28.5 inches of snow annually.
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) |
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
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) | 2.0 in | Coldest |
| February | 29°F (-2°C) | 1.8 in | Driest |
| March | 40°F (5°C) | 2.5 in | |
| April | 52°F (11°C) | 3.9 in | |
| May | 63°F (17°C) | 4.8 in | Wettest |
| June | 72°F (22°C) | 4.6 in | |
| July | 75°F (24°C) | 3.9 in | Warmest |
| August | 73°F (23°C) | 3.8 in | |
| September | 66°F (19°C) | 3.5 in | |
| October | 54°F (12°C) | 3.3 in | |
| November | 41°F (5°C) | 2.6 in | |
| December | 29°F (-2°C) | 2.2 in |
Hennepin has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 38.6 inches, with May being the wettest month (4.8") and February the driest (1.8").