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St. Peter, IL
Full City Profile · Illinois · Marion County County
3.0
/5.0
B
Good
256
Population
492/sq mi density
$55,000
Median Income
$32,242 per capita
$91,400
Home Value
$101,301 Zillow
$488
Median Rent
14.2% income on rent
55°F
Avg Temperature
293 sunny days/yr
212
Violent Crime/100K
1,059 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$55,000 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$91,400 home value, $488/mo rent
F
Safety
1.0 / 5.0
212 violent crimes/100K
C
Education
2.2 / 5.0
14.8% bachelor's degree or higher
St. Peter experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 41.2 inches. Air quality is rated Good with a median AQI of 43.
Temperature
29°F Jan (-2°C)
77°F Jul (25°C)
| Annual Average | 54.6°F |
| 1% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 592 ft (180 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 492/sq mi |
| Coordinates | 38.8676°N, 88.8504°W |
| Timezone | America/Chicago |
| County | Marion County County |
| Nearest Airport | St Louis Regional (ALN) 64 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 77.1 / 100 |
| Social Vulnerability | 68.6 / 100 |
| Community Resilience | 96.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| 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 | 29°F (-2°C) | 2.1 in | Coldest, Driest |
| February | 32°F (-0°C) | 2.2 in | |
| March | 43°F (6°C) | 3.9 in | |
| April | 54°F (12°C) | 3.8 in | |
| May | 64°F (18°C) | 4.2 in | Wettest |
| June | 73°F (23°C) | 4.1 in | |
| July | 77°F (25°C) | 3.9 in | Warmest |
| August | 75°F (24°C) | 3.0 in | |
| September | 68°F (20°C) | 3.1 in | |
| October | 56°F (14°C) | 2.9 in | |
| November | 44°F (7°C) | 3.7 in | |
| December | 33°F (1°C) | 3.4 in |
St. Peter has a seasonal temperature swing of 48°F / from 29°F in January to 77°F in July. Total annual precipitation is 40.1 inches, with May being the wettest month (4.2") and January the driest (2.1").