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Forreston, IL
Full City Profile · Illinois · Ogle County County
3.1
/5.0
B
Good
1,148
Population
1,221/sq mi density
$68,042
Median Income
$33,399 per capita
$116,500
Home Value
$162,514 Zillow
$783
Median Rent
19.5% income on rent
49°F
Avg Temperature
246 sunny days/yr
219
Violent Crime/100K
1,273 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$68,042 median income, 2.6% unemployment
A+
Affordability
5.0 / 5.0
$116,500 home value, $783/mo rent
F
Safety
1.0 / 5.0
219 violent crimes/100K
C
Education
2.1 / 5.0
13.7% bachelor's degree or higher
Forreston experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 73°F in July. The area gets 246 sunny days per year. Annual precipitation totals 40.0 inches. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 49.3°F |
| 9% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 936 ft (285 m) |
| Area | 0.9 sq mi (2.4 km²) |
| Population Density | 1,221/sq mi |
| Coordinates | 42.1273°N, 89.5784°W |
| Timezone | America/Chicago |
| County | Ogle County County |
| Nearest Airport | Chicago/Rockford International (RFD) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 71.1 / 100 |
| Social Vulnerability | 17.5 / 100 |
| Community Resilience | 86.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Very 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 | 22°F (-6°C) | 1.3 in | Coldest |
| February | 23°F (-5°C) | 1.3 in | Driest |
| March | 35°F (2°C) | 2.5 in | |
| April | 47°F (9°C) | 3.5 in | |
| May | 59°F (15°C) | 4.2 in | |
| June | 68°F (20°C) | 4.5 in | Wettest |
| July | 73°F (23°C) | 3.6 in | Warmest |
| August | 70°F (21°C) | 4.2 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 50°F (10°C) | 2.7 in | |
| November | 37°F (3°C) | 2.7 in | |
| December | 24°F (-5°C) | 2.0 in |
Forreston has a seasonal temperature swing of 51°F / from 22°F in January to 73°F in July. Total annual precipitation is 36.1 inches, with June being the wettest month (4.5") and February the driest (1.3").