Grand River, IA
Full City Profile · Iowa · Decatur County County
3.1
/5.0
B
Good
189
Population
995/sq mi density
$35,833
Median Income
$25,708 per capita
$38,400
Home Value
$210,072 Zillow
$844
Median Rent
38.1% income on rent
49°F
Avg Temperature
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
C
Economy
2.3 / 5.0
$35,833 median income, 10.8% unemployment
A+
Affordability
5.0 / 5.0
$38,400 home value, $844/mo rent
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 49°F (9°C). Winters average 21°F in January while summers reach 74°F in July. Annual precipitation totals 38.0 inches. The area receives 26.5 inches of snow annually.
Temperature
21°F Jan (-6°C)
74°F Jul (23°C)
| Annual Average | 49.2°F |
| 9% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 74°F (23°C) |
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
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 | 21°F (-6°C) | 0.9 in | Coldest, Driest |
| February | 26°F (-3°C) | 1.3 in | |
| March | 38°F (3°C) | 2.2 in | |
| April | 49°F (10°C) | 4.1 in | |
| May | 60°F (16°C) | 5.3 in | Wettest |
| June | 70°F (21°C) | 5.3 in | |
| July | 74°F (23°C) | 4.1 in | Warmest |
| August | 72°F (22°C) | 4.1 in | |
| September | 64°F (18°C) | 4.1 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 38°F (3°C) | 2.1 in | |
| December | 27°F (-3°C) | 1.5 in |
Grand River has a seasonal temperature swing of 53°F / from 21°F in January to 74°F in July. Total annual precipitation is 38.0 inches, with May being the wettest month (5.3") and January the driest (0.9").