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St. John, IN
Full City Profile · Indiana · Lake County County
3.9
/5.0
B+
Good
21,639
Population
1,699/sq mi density
$127,449
Median Income
$53,724 per capita
$370,800
Home Value
$348,866 Zillow
$971
Median Rent
40.6% income on rent
50°F
Avg Temperature
275 sunny days/yr
22
Violent Crime/100K
671 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$127,449 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$370,800 home value, $971/mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
A
Education
4.4 / 5.0
42.9% bachelor's degree or higher
St. John experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 23°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.9 inches. The area receives 29.7 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
23°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.7°F |
| 8% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 692 ft (211 m) |
| Area | 11.5 sq mi (29.7 km²) |
| Population Density | 1,699/sq mi |
| Coordinates | 41.4418°N, 87.4678°W |
| Timezone | America/Indiana/Indianapolis |
| County | Lake County County |
| Nearest Airport | Gary/Chicago International (GYY) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0452 ppm |
| NO₂ (Nitrogen Dioxide) | 13.8 ppb |
| SO₂ (Sulfur Dioxide) | 1.37 ppb |
| PM2.5 (Fine Particles) | 10.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.9 / 100 |
| Social Vulnerability | 48.7 / 100 |
| Community Resilience | 73.3 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1954 | MICHIGAN CITY, IN (LAKE MICHIGAN) | Avalanche | 3.0 m | 7 | 57 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.7 in | Coldest |
| February | 27°F (-3°C) | 1.5 in | Driest |
| March | 37°F (3°C) | 2.8 in | |
| April | 48°F (9°C) | 4.1 in | |
| May | 59°F (15°C) | 4.0 in | |
| June | 69°F (21°C) | 4.3 in | Wettest |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 71°F (22°C) | 3.7 in | |
| September | 64°F (18°C) | 3.7 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 40°F (5°C) | 3.4 in | |
| December | 28°F (-2°C) | 2.7 in |
St. John has a seasonal temperature swing of 50°F / from 23°F in January to 73°F in July. Total annual precipitation is 38.6 inches, with June being the wettest month (4.3") and February the driest (1.5").