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Grand River, IA
Full City Profile · Iowa · Decatur County County
2.8
/5.0
C+
Fair
189
Population
995/sq mi density
$35,833
Median Income
$25,708 per capita
$38,400
Home Value
$186,353 Zillow
$844
Median Rent
38.1% income on rent
51°F
Avg Temperature
282 sunny days/yr
159
Violent Crime/100K
1,746 property/100K
C+
Overall
2.8 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.0 / 5.0
$35,833 median income, 5.4% unemployment
A+
Affordability
5.0 / 5.0
$38,400 home value, $844/mo rent
F
Safety
1.0 / 5.0
159 violent crimes/100K
C
Education
2.0 / 5.0
12.8% bachelor's degree or higher
Grand River experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 23°F in January while summers reach 76°F in July. The area gets 282 sunny days per year. Air quality is rated Good with a median AQI of 43.
Temperature
23°F Jan (-5°C)
76°F Jul (24°C)
| Annual Average | 51.2°F |
| 5% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 282 days/yr |
Geography
| Elevation | 1,019 ft (311 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 995/sq mi |
| Coordinates | 40.8190°N, 93.9631°W |
| Timezone | America/Chicago |
| County | Decatur County County |
| Nearest Airport | Des Moines International (DSM) 49 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 23.6 / 100 |
| Social Vulnerability | 43.0 / 100 |
| Community Resilience | 41.1 / 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 | Very Low |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 0.9 in | Coldest, Driest |
| February | 28°F (-2°C) | 1.0 in | |
| March | 39°F (4°C) | 2.3 in | |
| April | 51°F (11°C) | 3.5 in | |
| May | 62°F (16°C) | 4.4 in | Wettest |
| June | 71°F (22°C) | 4.2 in | |
| July | 76°F (24°C) | 4.4 in | Warmest |
| August | 74°F (23°C) | 4.2 in | |
| September | 65°F (18°C) | 4.3 in | |
| October | 53°F (12°C) | 3.0 in | |
| November | 39°F (4°C) | 2.1 in | |
| December | 27°F (-3°C) | 1.3 in |
Grand River has a seasonal temperature swing of 52°F / from 23°F in January to 76°F in July. Total annual precipitation is 35.5 inches, with May being the wettest month (4.4") and January the driest (0.9").