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Franklin Grove, IL
Full City Profile · Illinois · Lee County County
3.1
/5.0
B
Good
1,086
Population
2,586/sq mi density
$60,833
Median Income
$30,081 per capita
$136,800
Home Value
$179,330 Zillow
$850
Median Rent
23.7% income on rent
48°F
Avg Temperature
275 sunny days/yr
102
Violent Crime/100K
410 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$60,833 median income, 0.7% unemployment
A+
Affordability
5.0 / 5.0
$136,800 home value, $850/mo rent
F
Safety
1.0 / 5.0
102 violent crimes/100K
C+
Education
2.5 / 5.0
19.1% bachelor's degree or higher
Franklin Grove experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 72°F in July. The area gets 275 sunny days per year. Annual precipitation totals 36.6 inches. Air quality is rated Good with a median AQI of 43.
Temperature
20°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 47.9°F |
| 11% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 810 ft (247 m) |
| Area | 0.4 sq mi (1.1 km²) |
| Population Density | 2,586/sq mi |
| Coordinates | 41.8413°N, 89.3000°W |
| Timezone | America/Chicago |
| County | Lee County County |
| Nearest Airport | Chicago/Rockford International (RFD) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 54.4 / 100 |
| Social Vulnerability | 23.2 / 100 |
| Community Resilience | 82.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.4 in | Coldest |
| February | 24°F (-4°C) | 1.2 in | Driest |
| March | 36°F (2°C) | 2.5 in | |
| April | 48°F (9°C) | 3.7 in | |
| May | 60°F (15°C) | 4.1 in | |
| June | 69°F (20°C) | 4.5 in | Wettest |
| July | 72°F (22°C) | 3.8 in | Warmest |
| August | 70°F (21°C) | 4.2 in | |
| September | 63°F (17°C) | 3.8 in | |
| October | 51°F (11°C) | 2.8 in | |
| November | 37°F (3°C) | 2.7 in | |
| December | 25°F (-4°C) | 2.1 in |
Franklin Grove has a seasonal temperature swing of 52°F / from 20°F in January to 72°F in July. Total annual precipitation is 36.6 inches, with June being the wettest month (4.5") and February the driest (1.2").