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Fairfax, IA
Full City Profile · Iowa · Johnson County County
3.7
/5.0
B+
Good
2,865
Population
789/sq mi density
$120,552
Median Income
$45,288 per capita
$278,800
Home Value
$294,828 Zillow
$1,188
Median Rent
26.8% income on rent
48°F
Avg Temperature
275 sunny days/yr
299
Violent Crime/100K
3,842 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$120,552 median income, 1.3% unemployment
A+
Affordability
5.0 / 5.0
$278,800 home value, $1,188/mo rent
F
Safety
1.0 / 5.0
299 violent crimes/100K
B+
Education
4.0 / 5.0
36.9% bachelor's degree or higher
Fairfax experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 35.9 inches. Air quality is rated Good with a median AQI of 43.
Temperature
20°F Jan (-7°C)
73°F Jul (23°C)
| Annual Average | 48.3°F |
| 11% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 752 ft (229 m) |
| Area | 3.6 sq mi (9.4 km²) |
| Population Density | 789/sq mi |
| Coordinates | 41.9255°N, 91.7778°W |
| Timezone | America/Chicago |
| County | Johnson County County |
| Nearest Airport | The Eastern Iowa (CID) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| PM2.5 (Fine Particles) | 10.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 87.4 / 100 |
| Social Vulnerability | 11.4 / 100 |
| Community Resilience | 96.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.1 in | Coldest |
| February | 25°F (-4°C) | 1.0 in | Driest |
| March | 37°F (3°C) | 2.2 in | |
| April | 50°F (10°C) | 3.4 in | |
| May | 62°F (16°C) | 4.1 in | |
| June | 71°F (22°C) | 4.7 in | Wettest |
| July | 73°F (23°C) | 4.3 in | Warmest |
| August | 72°F (22°C) | 4.3 in | |
| September | 64°F (18°C) | 4.1 in | |
| October | 52°F (11°C) | 2.6 in | |
| November | 37°F (3°C) | 2.2 in | |
| December | 24°F (-4°C) | 1.5 in |
Fairfax has a seasonal temperature swing of 53°F / from 20°F in January to 73°F in July. Total annual precipitation is 35.4 inches, with June being the wettest month (4.7") and February the driest (1.0").