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Thornton, IA
Full City Profile · Iowa · Franklin County County
3.2
/5.0
B
Good
534
Population
431/sq mi density
$66,979
Median Income
$33,158 per capita
$99,000
Home Value
$153,096 Zillow
$775
Median Rent
21.9% income on rent
47°F
Avg Temperature
260 sunny days/yr
209
Violent Crime/100K
3,323 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$66,979 median income, 1.7% unemployment
A+
Affordability
5.0 / 5.0
$99,000 home value, $775/mo rent
F
Safety
1.0 / 5.0
209 violent crimes/100K
C+
Education
2.6 / 5.0
19.9% bachelor's degree or higher
Thornton experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 17°F in January while summers reach 73°F in July. The area gets 260 sunny days per year. Annual precipitation totals 38.1 inches. Air quality is rated Good with a median AQI of 43.
Temperature
17°F Jan (-9°C)
73°F Jul (23°C)
| Annual Average | 46.6°F |
| 14% below US avg | |
| January Average | 17°F (-9°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 1,191 ft (363 m) |
| Area | 1.2 sq mi (3.2 km²) |
| Population Density | 431/sq mi |
| Coordinates | 42.9442°N, 93.3870°W |
| Timezone | America/Chicago |
| County | Franklin County County |
| Nearest Airport | Northeast Iowa Regional (CCY) 40 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 22.0 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 51.7 / 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 | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-9°C) | 0.8 in | Coldest, Driest |
| February | 21°F (-6°C) | 0.9 in | |
| March | 33°F (0°C) | 2.0 in | |
| April | 46°F (8°C) | 3.2 in | |
| May | 59°F (15°C) | 4.1 in | |
| June | 69°F (21°C) | 4.8 in | Wettest |
| July | 73°F (23°C) | 4.5 in | Warmest |
| August | 70°F (21°C) | 4.0 in | |
| September | 62°F (17°C) | 3.7 in | |
| October | 50°F (10°C) | 2.5 in | |
| November | 34°F (1°C) | 1.7 in | |
| December | 20°F (-7°C) | 1.1 in |
Thornton has a seasonal temperature swing of 56°F / from 17°F in January to 73°F in July. Total annual precipitation is 33.2 inches, with June being the wettest month (4.8") and January the driest (0.8").