Delmar, IA
Full City Profile · Iowa · Clinton County County
4.2
/5.0
A
Great
417
Population
549/sq mi density
$74,583
Median Income
$35,898 per capita
$123,400
Home Value
$160,852 Zillow
48°F
Avg Temperature
A
Overall
4.2 / 5.0
Strong
A+
Economy
4.5 / 5.0
$74,583 median income, 0.8% unemployment
A+
Affordability
5.0 / 5.0
$123,400 home value, /mo rent
B
Education
3.1 / 5.0
26.6% bachelor's degree or higher
Delmar experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 19°F in January while summers reach 73°F in July. Annual precipitation totals 36.7 inches. The area receives 30.3 inches of snow annually. Air quality is rated Good with a median AQI of 46.
Temperature
19°F Jan (-7°C)
73°F Jul (23°C)
| Annual Average | 47.9°F |
| 11% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 811 ft (247 m) |
| Area | 0.8 sq mi (2.0 km²) |
| Population Density | 549/sq mi |
| Coordinates | 41.9989°N, 90.6079°W |
| Timezone | America/Chicago |
| County | Clinton County County |
| Nearest Airport | Dubuque Regional (DBQ) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 46.0 |
| Rating | Good |
| Good Days % | 63.0% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0477 ppm |
| SO₂ (Sulfur Dioxide) | 1.32 ppb |
| PM2.5 (Fine Particles) | 11.0 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.8 / 100 |
| Social Vulnerability | 34.6 / 100 |
| Community Resilience | 87.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 1.3 in | Coldest, Driest |
| February | 23°F (-5°C) | 1.7 in | |
| March | 36°F (2°C) | 2.2 in | |
| April | 48°F (9°C) | 3.4 in | |
| May | 60°F (15°C) | 4.2 in | |
| June | 70°F (21°C) | 5.1 in | Wettest |
| July | 73°F (23°C) | 4.2 in | Warmest |
| August | 71°F (21°C) | 4.2 in | |
| September | 63°F (17°C) | 3.6 in | |
| October | 51°F (10°C) | 2.9 in | |
| November | 37°F (3°C) | 2.1 in | |
| December | 25°F (-4°C) | 1.8 in |
Delmar has a seasonal temperature swing of 54°F / from 19°F in January to 73°F in July. Total annual precipitation is 36.7 inches, with June being the wettest month (5.1") and January the driest (1.3").