Poplar Grove, IL
Full City Profile · Illinois · Boone County County
4.1
/5.0
A
Great
4,202
Population
533/sq mi density
$93,409
Median Income
$38,180 per capita
$253,500
Home Value
$280,176 Zillow
$1,443
Median Rent
24.7% income on rent
49°F
Avg Temperature
A
Overall
4.1 / 5.0
Strong
A
Economy
4.3 / 5.0
$93,409 median income, 5.5% unemployment
A+
Affordability
5.0 / 5.0
$253,500 home value, $1,443/mo rent
B
Education
3.1 / 5.0
25.7% bachelor's degree or higher
Poplar Grove experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 74°F in July. Annual precipitation totals 39.1 inches. The area receives 32.6 inches of snow annually.
Temperature
22°F Jan (-6°C)
74°F Jul (23°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 890 ft (271 m) |
| Area | 3.0 sq mi (7.7 km²) |
| Population Density | 533/sq mi |
| Coordinates | 42.3511°N, 88.8438°W |
| Timezone | America/Chicago |
| County | Boone County County |
| Nearest Airport | Chicago/Rockford International (RFD) 17 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.4 / 100 |
| Social Vulnerability | 27.9 / 100 |
| Community Resilience | 72.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.7 in | Coldest |
| February | 26°F (-4°C) | 1.7 in | Driest |
| March | 37°F (3°C) | 2.3 in | |
| April | 49°F (10°C) | 3.8 in | |
| May | 60°F (16°C) | 4.1 in | |
| June | 70°F (21°C) | 5.9 in | Wettest |
| July | 74°F (23°C) | 4.0 in | Warmest |
| August | 72°F (22°C) | 4.7 in | |
| September | 64°F (18°C) | 3.6 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 39°F (4°C) | 2.3 in | |
| December | 27°F (-3°C) | 2.1 in |
Poplar Grove has a seasonal temperature swing of 52°F / from 22°F in January to 74°F in July. Total annual precipitation is 39.1 inches, with June being the wettest month (5.9") and February the driest (1.7").