All Countries
Grinnell, IA
Full City Profile · Iowa · Poweshiek County County
3.6
/5.0
B+
Good
9,527
Population
1,674/sq mi density
$64,426
Median Income
$36,382 per capita
$191,700
Home Value
$204,472 Zillow
$876
Median Rent
28.8% income on rent
48°F
Avg Temperature
275 sunny days/yr
418
Violent Crime/100K
1,789 property/100K
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$64,426 median income, 3.1% unemployment
A+
Affordability
5.0 / 5.0
$191,700 home value, $876/mo rent
F
Safety
1.0 / 5.0
418 violent crimes/100K (10% above avg)
A
Education
4.3 / 5.0
41.1% bachelor's degree or higher
Grinnell 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. The area gets 275 sunny days per year. Annual precipitation totals 38.2 inches. The area receives 31.0 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
19°F Jan (-7°C)
73°F Jul (23°C)
| Annual Average | 47.5°F |
| 12% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 1,003 ft (306 m) |
| Area | 5.6 sq mi (14.4 km²) |
| Population Density | 1,674/sq mi |
| Coordinates | 41.7352°N, 92.7249°W |
| Timezone | America/Chicago |
| County | Poweshiek County County |
| Nearest Airport | Ottumwa Regional (OTM) 46 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 31.3 / 100 |
| Social Vulnerability | 21.4 / 100 |
| Community Resilience | 84.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively 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 | 19°F (-7°C) | 1.1 in | Coldest, Driest |
| February | 24°F (-4°C) | 1.1 in | |
| March | 36°F (2°C) | 2.3 in | |
| April | 49°F (9°C) | 3.4 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 70°F (21°C) | 4.7 in | Wettest |
| July | 73°F (23°C) | 4.1 in | Warmest |
| August | 71°F (22°C) | 4.3 in | |
| September | 63°F (17°C) | 4.0 in | |
| October | 52°F (11°C) | 2.7 in | |
| November | 37°F (3°C) | 2.1 in | |
| December | 24°F (-5°C) | 1.5 in |
Grinnell has a seasonal temperature swing of 53°F / from 19°F in January to 73°F in July. Total annual precipitation is 35.3 inches, with June being the wettest month (4.7") and January the driest (1.1").