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Modesto, IL
Full City Profile · Illinois · Macoupin County County
3.4
/5.0
B
Good
171
Population
305/sq mi density
$69,375
Median Income
$33,158 per capita
$68,800
Home Value
$142,395 Zillow
$642
Median Rent
10.8% income on rent
53°F
Avg Temperature
293 sunny days/yr
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.6 / 5.0
$69,375 median income, 1.4% unemployment
A+
Affordability
5.0 / 5.0
$68,800 home value, $642/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C+
Education
2.7 / 5.0
20.9% bachelor's degree or higher
Modesto 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 | 680 ft (207 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 305/sq mi |
| Coordinates | 39.4789°N, 89.9803°W |
| Timezone | America/Chicago |
| County | Macoupin County County |
| Nearest Airport | St Louis Regional (ALN) 41 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) | 1.7 in | Coldest, Driest |
| February | 31°F (-1°C) | 1.9 in | |
| March | 42°F (6°C) | 3.4 in | |
| April | 53°F (12°C) | 3.8 in | |
| May | 63°F (17°C) | 4.4 in | Wettest |
| June | 72°F (22°C) | 3.8 in | |
| July | 76°F (25°C) | 3.7 in | Warmest |
| August | 74°F (23°C) | 3.4 in | |
| September | 67°F (20°C) | 3.3 in | |
| October | 56°F (13°C) | 2.7 in | |
| November | 43°F (6°C) | 3.2 in | |
| December | 31°F (-0°C) | 2.8 in |
Modesto has a seasonal temperature swing of 48°F / from 28°F in January to 76°F in July. Total annual precipitation is 38.0 inches, with May being the wettest month (4.4") and January the driest (1.7").