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Gillespie, IL
Full City Profile · Illinois · Macoupin County County
3.1
/5.0
B
Good
3,118
Population
2,107/sq mi density
$76,806
Median Income
$37,996 per capita
$89,500
Home Value
$109,913 Zillow
$756
Median Rent
12.9% income on rent
53°F
Avg Temperature
293 sunny days/yr
743
Violent Crime/100K
3,197 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$76,806 median income, 2.8% unemployment
A+
Affordability
5.0 / 5.0
$89,500 home value, $756/mo rent
F
Safety
1.0 / 5.0
743 violent crimes/100K (95% above avg)
C
Education
2.5 / 5.0
18.6% bachelor's degree or higher
Gillespie experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 28°F in January while summers reach 76°F in July. The area gets 293 sunny days per year. Annual precipitation totals 40.0 inches. The area receives 16.5 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
28°F Jan (-2°C)
76°F Jul (25°C)
| Annual Average | 53.4°F |
| 1% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 663 ft (202 m) |
| Area | 1.5 sq mi (3.8 km²) |
| Population Density | 2,107/sq mi |
| Coordinates | 39.1254°N, 89.8173°W |
| Timezone | America/Chicago |
| County | Macoupin County County |
| Nearest Airport | St Louis Regional (ALN) 20 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0477 ppm |
| NO₂ (Nitrogen Dioxide) | 3.9 ppb |
| SO₂ (Sulfur Dioxide) | 0.61 ppb |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 79.9 / 100 |
| Social Vulnerability | 50.7 / 100 |
| Community Resilience | 72.7 / 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 Moderate |
| Lightning | Relatively High |
| 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 | 28°F (-2°C) | 1.9 in | Coldest, Driest |
| February | 32°F (-0°C) | 2.0 in | |
| March | 43°F (6°C) | 3.5 in | |
| April | 54°F (12°C) | 3.9 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 3.9 in | |
| July | 76°F (25°C) | 3.6 in | Warmest |
| August | 75°F (24°C) | 3.3 in | |
| September | 68°F (20°C) | 3.2 in | |
| October | 56°F (13°C) | 2.8 in | |
| November | 44°F (6°C) | 3.5 in | |
| December | 32°F (0°C) | 3.0 in |
Gillespie has a seasonal temperature swing of 48°F / from 28°F in January to 76°F in July. Total annual precipitation is 38.8 inches, with May being the wettest month (4.3") and January the driest (1.9").