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Derby, IA
Full City Profile · Iowa · Wayne County County
2.7
/5.0
C+
Fair
106
Population
408/sq mi density
$58,750
Median Income
$19,553 per capita
$73,800
Home Value
$75,072 Zillow
50°F
Avg Temperature
275 sunny days/yr
236
Violent Crime/100K
2,973 property/100K
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
B+
Economy
3.6 / 5.0
$58,750 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$73,800 home value, /mo rent
F
Safety
1.0 / 5.0
236 violent crimes/100K
F
Education
1.1 / 5.0
1.4% bachelor's degree or higher
Derby experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 22°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 40.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-5°C)
75°F Jul (24°C)
| Annual Average | 49.9°F |
| 8% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,088 ft (332 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 408/sq mi |
| Coordinates | 40.9303°N, 93.4565°W |
| Timezone | America/Chicago |
| County | Wayne County County |
| Nearest Airport | Des Moines International (DSM) 41 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 22.0 / 100 |
| Social Vulnerability | 73.9 / 100 |
| Community Resilience | 46.2 / 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 | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 1.0 in | Coldest, Driest |
| February | 27°F (-3°C) | 1.1 in | |
| March | 39°F (4°C) | 2.4 in | |
| April | 51°F (10°C) | 3.5 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 71°F (21°C) | 4.5 in | Wettest |
| July | 75°F (24°C) | 4.5 in | Warmest |
| August | 73°F (23°C) | 4.1 in | |
| September | 65°F (18°C) | 4.5 in | |
| October | 53°F (12°C) | 3.0 in | |
| November | 38°F (4°C) | 2.2 in | |
| December | 26°F (-3°C) | 1.4 in |
Derby has a seasonal temperature swing of 52°F / from 22°F in January to 75°F in July. Total annual precipitation is 36.2 inches, with June being the wettest month (4.5") and January the driest (1.0").