Thornton, IA
Full City Profile · Iowa · Franklin County County
4.0
/5.0
A
Great
534
Population
431/sq mi density
$66,979
Median Income
$33,158 per capita
$99,000
Home Value
$161,949 Zillow
$775
Median Rent
21.9% income on rent
46°F
Avg Temperature
A
Overall
4.0 / 5.0
Strong
A
Economy
4.3 / 5.0
$66,979 median income, 2.5% unemployment
A+
Affordability
5.0 / 5.0
$99,000 home value, $775/mo rent
C+
Education
2.6 / 5.0
19.9% bachelor's degree or higher
Thornton experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 16°F in January while summers reach 72°F in July. Annual precipitation totals 36.2 inches. The area receives 44.4 inches of snow annually.
Temperature
16°F Jan (-9°C)
72°F Jul (22°C)
| Annual Average | 45.6°F |
| 16% below US avg | |
| January Average | 16°F (-9°C) |
| July Average | 72°F (22°C) |
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
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 | 16°F (-9°C) | 0.9 in | Coldest, Driest |
| February | 20°F (-7°C) | 1.2 in | |
| March | 33°F (0°C) | 2.3 in | |
| April | 46°F (8°C) | 4.2 in | |
| May | 58°F (15°C) | 5.2 in | |
| June | 69°F (20°C) | 5.4 in | Wettest |
| July | 72°F (22°C) | 4.4 in | Warmest |
| August | 69°F (21°C) | 3.8 in | |
| September | 61°F (16°C) | 3.5 in | |
| October | 48°F (9°C) | 2.5 in | |
| November | 34°F (1°C) | 1.7 in | |
| December | 22°F (-6°C) | 1.3 in |
Thornton has a seasonal temperature swing of 56°F / from 16°F in January to 72°F in July. Total annual precipitation is 36.3 inches, with June being the wettest month (5.4") and January the driest (0.9").