Decatur, IA
Full City Profile · Iowa · Decatur County County
2.9
/5.0
C+
Fair
163
Population
429/sq mi density
$33,750
Median Income
$19,577 per capita
$84,200
Home Value
$139,978 Zillow
52°F
Avg Temperature
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Economy
2.5 / 5.0
$33,750 median income, 1.3% unemployment
A+
Affordability
5.0 / 5.0
$84,200 home value, /mo rent
F
Education
1.3 / 5.0
3.4% bachelor's degree or higher
Decatur experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 24°F in January while summers reach 76°F in July. Annual precipitation totals 37.4 inches. The area receives 26.7 inches of snow annually.
Temperature
24°F Jan (-4°C)
76°F Jul (24°C)
| Annual Average | 51.6°F |
| 4% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 76°F (24°C) |
Geography
| Elevation | 1,132 ft (345 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 429/sq mi |
| Coordinates | 40.7427°N, 93.8328°W |
| Timezone | America/Chicago |
| County | Decatur County County |
| Nearest Airport | Des Moines International (DSM) 53 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 23.6 / 100 |
| Social Vulnerability | 43.0 / 100 |
| Community Resilience | 41.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 1.0 in | Coldest, Driest |
| February | 29°F (-2°C) | 1.4 in | |
| March | 41°F (5°C) | 2.2 in | |
| April | 52°F (11°C) | 4.3 in | |
| May | 62°F (17°C) | 5.1 in | Wettest |
| June | 72°F (22°C) | 4.8 in | |
| July | 76°F (24°C) | 4.1 in | Warmest |
| August | 74°F (23°C) | 4.4 in | |
| September | 66°F (19°C) | 3.7 in | |
| October | 54°F (12°C) | 2.8 in | |
| November | 40°F (5°C) | 2.1 in | |
| December | 29°F (-2°C) | 1.5 in |
Decatur has a seasonal temperature swing of 52°F / from 24°F in January to 76°F in July. Total annual precipitation is 37.4 inches, with May being the wettest month (5.1") and January the driest (1.0").