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Castalia, IA
Full City Profile · Iowa · Winneshiek County County
3.0
/5.0
B
Good
142
Population
245/sq mi density
$50,714
Median Income
$36,692 per capita
$96,900
Home Value
$288,138 Zillow
46°F
Avg Temperature
260 sunny days/yr
12
Violent Crime/100K
1,201 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$50,714 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$96,900 home value, /mo rent
F
Safety
1.4 / 5.0
12 violent crimes/100K
D
Education
1.5 / 5.0
6.7% bachelor's degree or higher
Castalia experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 17°F in January while summers reach 72°F in July. The area gets 260 sunny days per year. Annual precipitation totals 38.9 inches. The area receives 39.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
17°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 46.0°F |
| 15% below US avg | |
| January Average | 17°F (-9°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,249 ft (381 m) |
| Area | 0.6 sq mi (1.5 km²) |
| Population Density | 245/sq mi |
| Coordinates | 43.1126°N, 91.6769°W |
| Timezone | America/Chicago |
| County | Winneshiek County County |
| Nearest Airport | Northeast Iowa Regional (CCY) 47 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 36.2 / 100 |
| Social Vulnerability | 12.2 / 100 |
| Community Resilience | 91.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-9°C) | 0.9 in | Coldest, Driest |
| February | 21°F (-6°C) | 1.0 in | |
| March | 33°F (1°C) | 2.1 in | |
| April | 47°F (8°C) | 3.4 in | |
| May | 59°F (15°C) | 4.0 in | |
| June | 68°F (20°C) | 4.4 in | |
| July | 72°F (22°C) | 4.1 in | Warmest |
| August | 69°F (21°C) | 4.4 in | Wettest |
| September | 61°F (16°C) | 3.7 in | |
| October | 49°F (10°C) | 2.5 in | |
| November | 34°F (1°C) | 2.0 in | |
| December | 20°F (-7°C) | 1.3 in |
Castalia has a seasonal temperature swing of 55°F / from 17°F in January to 72°F in July. Total annual precipitation is 33.8 inches, with August being the wettest month (4.4") and January the driest (0.9").