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Lake Petersburg, IL
Full City Profile · Illinois · Sangamon County County
4.2
/5.0
A
Great
769
Population
425/sq mi density
$124,643
Median Income
$67,272 per capita
$336,200
Home Value
$202,729 Zillow
52°F
Avg Temperature
302 sunny days/yr
A
Overall
4.2 / 5.0
Strong
A+
Economy
5.0 / 5.0
$124,643 median income, 1.6% unemployment
A+
Affordability
5.0 / 5.0
$336,200 home value, /mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A
Education
4.2 / 5.0
40.6% bachelor's degree or higher
Lake Petersburg experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 26°F in January while summers reach 75°F in July. The area gets 302 sunny days per year. Annual precipitation totals 38.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
26°F Jan (-3°C)
75°F Jul (24°C)
| Annual Average | 52.0°F |
| 4% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 594 ft (181 m) |
| Area | 2.0 sq mi (5.3 km²) |
| Population Density | 425/sq mi |
| Coordinates | 39.9843°N, 89.8562°W |
| Timezone | America/Chicago |
| County | Sangamon County County |
| Nearest Airport | General Downing - Peoria International (PIA) 48 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 | 26°F (-3°C) | 1.5 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.7 in | |
| March | 41°F (5°C) | 3.1 in | |
| April | 53°F (12°C) | 3.6 in | |
| May | 63°F (17°C) | 4.3 in | Wettest |
| June | 72°F (22°C) | 3.8 in | |
| July | 75°F (24°C) | 3.7 in | Warmest |
| August | 74°F (23°C) | 3.4 in | |
| September | 67°F (19°C) | 3.4 in | |
| October | 55°F (13°C) | 2.7 in | |
| November | 42°F (5°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.6 in |
Lake Petersburg has a seasonal temperature swing of 49°F / from 26°F in January to 75°F in July. Total annual precipitation is 36.9 inches, with May being the wettest month (4.3") and January the driest (1.5").