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Union, IA
Full City Profile · Iowa · Hardin County County
3.0
/5.0
B
Good
391
Population
686/sq mi density
$60,000
Median Income
$35,159 per capita
$72,600
Home Value
$91,855 Zillow
$775
Median Rent
31.8% income on rent
47°F
Avg Temperature
260 sunny days/yr
270
Violent Crime/100K
540 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$60,000 median income, 1.4% unemployment
A+
Affordability
5.0 / 5.0
$72,600 home value, $775/mo rent
F
Safety
1.0 / 5.0
270 violent crimes/100K
C
Education
2.3 / 5.0
15.8% bachelor's degree or higher
Union experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 17°F in January while summers reach 73°F in July. The area gets 260 sunny days per year. Annual precipitation totals 37.9 inches. The area receives 33.2 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
17°F Jan (-8°C)
73°F Jul (23°C)
| Annual Average | 46.9°F |
| 13% below US avg | |
| January Average | 17°F (-8°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 929 ft (283 m) |
| Area | 0.6 sq mi (1.4 km²) |
| Population Density | 686/sq mi |
| Coordinates | 42.2435°N, 93.0625°W |
| Timezone | America/Chicago |
| County | Hardin County County |
| Nearest Airport | Waterloo Regional (ALO) 40 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 58.4 / 100 |
| Social Vulnerability | 38.3 / 100 |
| Community Resilience | 80.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| 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 | 17°F (-8°C) | 0.9 in | Coldest, Driest |
| February | 23°F (-5°C) | 1.0 in | |
| March | 35°F (2°C) | 2.2 in | |
| April | 48°F (9°C) | 3.2 in | |
| May | 60°F (16°C) | 4.2 in | |
| June | 70°F (21°C) | 4.8 in | Wettest |
| July | 73°F (23°C) | 4.3 in | Warmest |
| August | 71°F (22°C) | 4.2 in | |
| September | 63°F (17°C) | 3.5 in | |
| October | 51°F (10°C) | 2.6 in | |
| November | 35°F (2°C) | 1.8 in | |
| December | 22°F (-6°C) | 1.2 in |
Union has a seasonal temperature swing of 56°F / from 17°F in January to 73°F in July. Total annual precipitation is 33.9 inches, with June being the wettest month (4.8") and January the driest (0.9").