All Countries
Duncan, IA
Full City Profile · Iowa · Hancock County County
2.4
/5.0
C
Fair
41
Population
52/sq mi density
46°F
Avg Temperature
260 sunny days/yr
302
Violent Crime/100K
1,260 property/100K
C
Overall
2.4 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
302 violent crimes/100K
B+
Education
3.8 / 5.0
0.0% bachelor's degree or higher
Duncan experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 15°F in January while summers reach 72°F in July. The area gets 260 sunny days per year. Annual precipitation totals 34.3 inches. Air quality is rated Good with a median AQI of 43.
Temperature
15°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 45.5°F |
| 16% below US avg | |
| January Average | 15°F (-9°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,263 ft (385 m) |
| Area | 0.8 sq mi (2.0 km²) |
| Population Density | 52/sq mi |
| Coordinates | 43.1082°N, 93.7021°W |
| Timezone | America/Chicago |
| County | Hancock County County |
| Nearest Airport | Fort Dodge Regional (FOD) 46 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 28.8 / 100 |
| Social Vulnerability | 19.7 / 100 |
| Community Resilience | 80.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-9°C) | 0.8 in | Coldest, Driest |
| February | 20°F (-7°C) | 0.8 in | |
| March | 32°F (0°C) | 1.9 in | |
| April | 46°F (8°C) | 3.1 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 69°F (21°C) | 4.5 in | Wettest |
| July | 72°F (22°C) | 4.3 in | Warmest |
| August | 70°F (21°C) | 3.8 in | |
| September | 62°F (17°C) | 3.5 in | |
| October | 50°F (10°C) | 2.2 in | |
| November | 34°F (1°C) | 1.5 in | |
| December | 20°F (-7°C) | 1.2 in |
Duncan has a seasonal temperature swing of 57°F / from 15°F in January to 72°F in July. Total annual precipitation is 31.2 inches, with June being the wettest month (4.5") and January the driest (0.8").