Derby, IA
Full City Profile · Iowa · Wayne County County
3.2
/5.0
B
Good
106
Population
408/sq mi density
$58,750
Median Income
$19,553 per capita
$73,800
Home Value
$75,072 Zillow
48°F
Avg Temperature
B
Overall
3.2 / 5.0
Good 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
Education
1.1 / 5.0
1.4% bachelor's degree or higher
Derby experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 21°F in January while summers reach 73°F in July. Annual precipitation totals 37.3 inches. The area receives 24.1 inches of snow annually.
Temperature
21°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 48.3°F |
| 11% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 73°F (23°C) |
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
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 | 21°F (-6°C) | 1.0 in | Coldest, Driest |
| February | 25°F (-4°C) | 1.4 in | |
| March | 37°F (3°C) | 1.9 in | |
| April | 48°F (9°C) | 4.2 in | |
| May | 59°F (15°C) | 5.4 in | Wettest |
| June | 69°F (20°C) | 4.9 in | |
| July | 73°F (23°C) | 4.2 in | Warmest |
| August | 71°F (22°C) | 4.4 in | |
| September | 63°F (17°C) | 3.7 in | |
| October | 51°F (10°C) | 3.0 in | |
| November | 37°F (3°C) | 2.0 in | |
| December | 26°F (-3°C) | 1.3 in |
Derby has a seasonal temperature swing of 52°F / from 21°F in January to 73°F in July. Total annual precipitation is 37.3 inches, with May being the wettest month (5.4") and January the driest (1.0").