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Hillsboro, IL
Full City Profile · Illinois · Montgomery County County
3.0
/5.0
B
Good
5,693
Population
652/sq mi density
$48,158
Median Income
$22,683 per capita
$95,800
Home Value
$151,578 Zillow
$841
Median Rent
28.2% income on rent
56°F
Avg Temperature
293 sunny days/yr
234
Violent Crime/100K
1,641 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$48,158 median income, 1.7% unemployment
A+
Affordability
5.0 / 5.0
$95,800 home value, $841/mo rent
F
Safety
1.0 / 5.0
234 violent crimes/100K
C
Education
2.0 / 5.0
12.5% bachelor's degree or higher
Hillsboro enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 30°F in January while summers reach 78°F in July. The area gets 293 sunny days per year. Annual precipitation totals 42.1 inches. Air quality is rated Good with a median AQI of 43.
Temperature
30°F Jan (-1°C)
78°F Jul (25°C)
| Annual Average | 55.5°F |
| 3% above US avg | |
| January Average | 30°F (-1°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 623 ft (190 m) |
| Area | 8.7 sq mi (22.6 km²) |
| Population Density | 652/sq mi |
| Coordinates | 39.1762°N, 89.4729°W |
| Timezone | America/Chicago |
| County | Montgomery County County |
| Nearest Airport | St Louis Regional (ALN) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 65.4 / 100 |
| Social Vulnerability | 55.4 / 100 |
| Community Resilience | 76.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 2.0 in | Coldest, Driest |
| February | 31°F (-0°C) | 2.0 in | |
| March | 42°F (6°C) | 3.5 in | |
| April | 53°F (12°C) | 4.1 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 4.1 in | |
| July | 78°F (25°C) | 3.6 in | Warmest |
| August | 74°F (24°C) | 3.2 in | |
| September | 67°F (20°C) | 3.2 in | |
| October | 56°F (13°C) | 2.8 in | |
| November | 44°F (6°C) | 3.6 in | |
| December | 32°F (0°C) | 3.0 in |
Hillsboro has a seasonal temperature swing of 48°F / from 30°F in January to 78°F in July. Total annual precipitation is 39.4 inches, with May being the wettest month (4.3") and January the driest (2.0").