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 Average49.4°F
9% below US avg
January Average22°F (-6°C)
July Average74°F (23°C)

Geography

Elevation890 ft (271 m)
Area3.0 sq mi (7.7 km²)
Population Density533/sq mi
Coordinates42.3511°N, 88.8438°W
TimezoneAmerica/Chicago
CountyBoone County County
Nearest AirportChicago/Rockford International (RFD)
17 miles away

Precipitation & Snow

Annual Rainfall 39.1"
3% above US avg
Snowfall 32.6"
Wettest Month (Jun) 5.88"
Driest Month (Feb) 1.67"

Air Quality

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score57.4 / 100
Social Vulnerability27.9 / 100
Community Resilience72.2 / 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)

Earthquake History

8 earthquakes (M2.5+) within 150 km since 1990. Strongest: M4.2. Most recent: M2.6 on Mar 15, 2025.

Jun 28, 2004 12 km NW of Dayton, Illinois M4.2 99 km
Feb 10, 2010 2 km NW of Lily Lake, Illinois M3.8 51 km
Sep 2, 1999 8 km W of Amboy, Illinois M3.5 85 km
Nov 4, 2013 1 km SSW of Lyons, Illinois M3.2 104 km
Jul 15, 2024 2 km WNW of Somonauk, Illinois M3.1 79 km
Mar 25, 2015 3 km WNW of Lake in the Hills, Illinois M2.9 43 km
Jun 10, 2013 4 km NNE of Virgil, Illinois M2.6 49 km
Mar 15, 2025 6 km W of Dwight, Illinois M2.6 144 km
Source: USGS (M2.5+, 1990-2025)

Tornado History

621 tornadoes (EF0+) within 100 km since 1950. Strongest: EF5. Total: 77 fatalities, 1,613 injuries.

Date Rating Distance Fatalities
Aug 28, 1990 EF5 85 km 29
Apr 9, 2015 EF4 67 km 2
Apr 27, 1984 EF4 80 km 1
Sep 28, 1972 EF4 81 km 0
Apr 21, 1967 EF4 16 km 24
Apr 21, 1967 EF4 52 km 1
Apr 11, 1965 EF4 41 km 6
Jun 20, 2021 EF3 86 km 0
Jun 16, 2014 EF3 93 km 0
Jan 7, 2008 EF3 5 km 0
Jan 7, 2008 EF3 48 km 0
Aug 18, 2005 EF3 79 km 1
Jun 17, 1992 EF3 81 km 0
Apr 27, 1984 EF3 99 km 1
Jun 5, 1980 EF3 87 km 0
Aug 5, 1979 EF3 71 km 0
Jun 30, 1977 EF3 87 km 0
Mar 12, 1976 EF3 90 km 0
Aug 2, 1967 EF3 100 km 2
Apr 16, 1967 EF3 91 km 0
Source: NOAA SPC (EF0+, 1950-2024)

Wildfire History

3 wildfires (100+ acres) within 100 km. Largest: IBSP SOUTH F1 RX (690 ac, 2024).

Year Name Acres Distance
2024 IBSP SOUTH F1 RX 690 85 km
2024 RX-HWY Y - SOUTH 553 69 km
2009 COLD SPRINGS 552 74 km
Source: NIFC/IRWIN (100+ acres)

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").

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