Alton, IN
Full City Profile · Indiana · Perry County County
2.7
/5.0
C+
Fair
35
Population
206/sq mi density
$65,114
Median Income
$40,294 per capita
$215,900
Home Value
$119,303 Zillow
56°F
Avg Temperature
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
D
Economy
1.9 / 5.0
$65,114 median income, 22.2% unemployment
A+
Affordability
4.8 / 5.0
$215,900 home value, /mo rent
F
Education
1.5 / 5.0
5.7% bachelor's degree or higher
Alton enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 33°F in January while summers reach 77°F in July. Annual precipitation totals 50.9 inches. The area receives 8.3 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
33°F Jan (1°C)
77°F Jul (25°C)
| Annual Average | 56.3°F |
| 4% above US avg | |
| January Average | 33°F (1°C) |
| July Average | 77°F (25°C) |
Geography
| Elevation | 407 ft (124 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 206/sq mi |
| Coordinates | 38.1201°N, 86.4186°W |
| Timezone | America/Indiana/Indianapolis |
| County | Perry County County |
| Nearest Airport | Louisville Muhammad Ali International (SDF) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
| Good Days % | 86.7% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0463 ppm |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 35.0 / 100 |
| Social Vulnerability | 35.6 / 100 |
| Community Resilience | 67.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (1°C) | 3.6 in | Coldest |
| February | 37°F (3°C) | 3.4 in | |
| March | 46°F (8°C) | 4.9 in | |
| April | 57°F (14°C) | 5.3 in | |
| May | 66°F (19°C) | 5.7 in | Wettest |
| June | 74°F (23°C) | 4.8 in | |
| July | 77°F (25°C) | 4.5 in | Warmest |
| August | 76°F (24°C) | 3.2 in | Driest |
| September | 69°F (21°C) | 4.0 in | |
| October | 57°F (14°C) | 3.7 in | |
| November | 47°F (8°C) | 3.7 in | |
| December | 37°F (3°C) | 4.2 in |
Alton has a seasonal temperature swing of 44°F / from 33°F in January to 77°F in July. Total annual precipitation is 50.9 inches, with May being the wettest month (5.7") and August the driest (3.2").