Portsmouth, IA
Full City Profile · Iowa · Shelby County County
3.8
/5.0
B+
Good
200
Population
645/sq mi density
$79,643
Median Income
$41,251 per capita
$115,500
Home Value
$273,165 Zillow
$575
Median Rent
15.0% income on rent
50°F
Avg Temperature
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$79,643 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$115,500 home value, $575/mo rent
D
Education
1.9 / 5.0
10.7% bachelor's degree or higher
Portsmouth experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 21°F in January while summers reach 75°F in July. Annual precipitation totals 34.3 inches. The area receives 30.5 inches of snow annually.
Temperature
21°F Jan (-6°C)
75°F Jul (24°C)
| Annual Average | 49.5°F |
| 8% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 1,229 ft (375 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 645/sq mi |
| Coordinates | 41.6503°N, 95.5195°W |
| Timezone | America/Chicago |
| County | Shelby County County |
| Nearest Airport | Eppley Airfield (OMA) 31 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 22.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 87.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Moderate |
| 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 | 25°F (-4°C) | 1.0 in | |
| March | 38°F (3°C) | 2.1 in | |
| April | 50°F (10°C) | 3.3 in | |
| May | 62°F (17°C) | 4.7 in | |
| June | 72°F (22°C) | 5.2 in | Wettest |
| July | 75°F (24°C) | 3.7 in | Warmest |
| August | 72°F (22°C) | 4.3 in | |
| September | 65°F (18°C) | 4.0 in | |
| October | 52°F (11°C) | 2.4 in | |
| November | 38°F (3°C) | 1.4 in | |
| December | 26°F (-3°C) | 1.3 in |
Portsmouth has a seasonal temperature swing of 54°F / from 21°F in January to 75°F in July. Total annual precipitation is 34.3 inches, with June being the wettest month (5.2") and January the driest (0.9").