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Janesville, IA
Full City Profile · Iowa · Bremer County County
3.4
/5.0
B
Good
1,012
Population
728/sq mi density
$84,231
Median Income
$37,851 per capita
$214,700
Home Value
$303,558 Zillow
$625
Median Rent
23.3% income on rent
49°F
Avg Temperature
260 sunny days/yr
544
Violent Crime/100K
1,492 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.7 / 5.0
$84,231 median income, 2.1% unemployment
A+
Affordability
5.0 / 5.0
$214,700 home value, $625/mo rent
F
Safety
1.0 / 5.0
544 violent crimes/100K (43% above avg)
B
Education
3.1 / 5.0
25.8% bachelor's degree or higher
Janesville experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 19°F in January while summers reach 75°F in July. The area gets 260 sunny days per year. Annual precipitation totals 36.3 inches. The area receives 39.1 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
19°F Jan (-7°C)
75°F Jul (24°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 908 ft (277 m) |
| Area | 1.4 sq mi (3.6 km²) |
| Population Density | 728/sq mi |
| Coordinates | 42.6458°N, 92.4624°W |
| Timezone | America/Chicago |
| County | Bremer County County |
| Nearest Airport | Waterloo Regional (ALO) 7 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0471 ppm |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 24.6 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 98.0 / 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 | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 0.9 in | Coldest, Driest |
| February | 22°F (-5°C) | 1.0 in | |
| March | 35°F (2°C) | 2.3 in | |
| April | 48°F (9°C) | 3.5 in | |
| May | 60°F (16°C) | 4.2 in | |
| June | 70°F (21°C) | 4.5 in | |
| July | 75°F (24°C) | 4.7 in | Warmest, Wettest |
| August | 71°F (22°C) | 4.1 in | |
| September | 63°F (17°C) | 3.5 in | |
| October | 51°F (10°C) | 2.6 in | |
| November | 35°F (2°C) | 1.9 in | |
| December | 21°F (-6°C) | 1.3 in |
Janesville has a seasonal temperature swing of 55°F / from 19°F in January to 75°F in July. Total annual precipitation is 34.5 inches, with July being the wettest month (4.7") and January the driest (0.9").