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Williamsville, IL
Full City Profile · Illinois · Sangamon County County
3.8
/5.0
B+
Good
1,519
Population
980/sq mi density
$104,135
Median Income
$57,915 per capita
$187,000
Home Value
$244,339 Zillow
$1,055
Median Rent
19.3% income on rent
54°F
Avg Temperature
302 sunny days/yr
576
Violent Crime/100K
1,009 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$104,135 median income, 1.2% unemployment
A+
Affordability
5.0 / 5.0
$187,000 home value, $1,055/mo rent
F
Safety
1.0 / 5.0
576 violent crimes/100K (52% above avg)
A
Education
4.2 / 5.0
39.5% bachelor's degree or higher
Williamsville experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 28°F in January while summers reach 77°F in July. The area gets 302 sunny days per year. Annual precipitation totals 38.0 inches. The area receives 21.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
28°F Jan (-2°C)
77°F Jul (25°C)
| Annual Average | 54.0°F |
| 0% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 589 ft (180 m) |
| Area | 1.6 sq mi (4.0 km²) |
| Population Density | 980/sq mi |
| Coordinates | 39.9561°N, 89.5436°W |
| Timezone | America/Chicago |
| County | Sangamon County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 49 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0483 ppm |
| PM2.5 (Fine Particles) | 8.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.7 / 100 |
| Social Vulnerability | 32.0 / 100 |
| Community Resilience | 92.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively High |
| 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 | 30°F (-1°C) | 1.7 in | |
| March | 42°F (5°C) | 3.1 in | |
| April | 53°F (12°C) | 3.6 in | |
| May | 63°F (17°C) | 4.2 in | Wettest |
| June | 72°F (22°C) | 3.8 in | |
| July | 77°F (25°C) | 3.7 in | Warmest |
| August | 74°F (23°C) | 3.5 in | |
| September | 67°F (19°C) | 3.2 in | |
| October | 55°F (13°C) | 2.7 in | |
| November | 42°F (6°C) | 2.9 in | |
| December | 31°F (-1°C) | 2.6 in |
Williamsville has a seasonal temperature swing of 49°F / from 28°F in January to 77°F in July. Total annual precipitation is 36.6 inches, with May being the wettest month (4.2") and January the driest (1.7").