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Walnut, IA
Full City Profile · Iowa · Shelby County County
3.1
/5.0
B
Good
1,339
Population
609/sq mi density
$65,278
Median Income
$29,902 per capita
$97,900
Home Value
$193,887 Zillow
$844
Median Rent
23.2% income on rent
49°F
Avg Temperature
275 sunny days/yr
246
Violent Crime/100K
1,421 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$65,278 median income, 1.1% unemployment
A+
Affordability
5.0 / 5.0
$97,900 home value, $844/mo rent
F
Safety
1.0 / 5.0
246 violent crimes/100K
C
Education
2.3 / 5.0
15.8% bachelor's degree or higher
Walnut experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.1 inches. The area receives 27.3 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
75°F Jul (24°C)
| Annual Average | 49.3°F |
| 9% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,341 ft (409 m) |
| Area | 2.2 sq mi (5.7 km²) |
| Population Density | 609/sq mi |
| Coordinates | 41.4895°N, 95.2197°W |
| Timezone | America/Chicago |
| County | Shelby County County |
| Nearest Airport | Eppley Airfield (OMA) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 22.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 87.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very 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 | 21°F (-6°C) | 0.8 in | Coldest, Driest |
| February | 26°F (-3°C) | 0.9 in | |
| March | 37°F (3°C) | 2.2 in | |
| April | 50°F (10°C) | 3.2 in | |
| May | 61°F (16°C) | 4.2 in | |
| June | 71°F (22°C) | 4.4 in | Wettest |
| July | 75°F (24°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 3.8 in | |
| September | 64°F (18°C) | 4.2 in | |
| October | 52°F (11°C) | 2.6 in | |
| November | 37°F (3°C) | 1.5 in | |
| December | 24°F (-4°C) | 1.1 in |
Walnut has a seasonal temperature swing of 54°F / from 21°F in January to 75°F in July. Total annual precipitation is 32.6 inches, with June being the wettest month (4.4") and January the driest (0.8").