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Thornburg, IA
Full City Profile · Iowa · Keokuk County County
2.7
/5.0
C+
Fair
43
Population
215/sq mi density
$39,821
Median Income
$25,014 per capita
49°F
Avg Temperature
275 sunny days/yr
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
C
Economy
2.4 / 5.0
$39,821 median income, 11.9% unemployment
C+
Safety
2.5 / 5.0
0 violent crimes/100K
B
Education
3.2 / 5.0
27.5% bachelor's degree or higher
Thornburg experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 74°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
74°F Jul (23°C)
| Annual Average | 48.9°F |
| 9% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 878 ft (268 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 215/sq mi |
| Coordinates | 41.4558°N, 92.3323°W |
| Timezone | America/Chicago |
| County | Keokuk County County |
| Nearest Airport | Ottumwa Regional (OTM) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 21.9 / 100 |
| Social Vulnerability | 21.6 / 100 |
| Community Resilience | 81.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively 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 | 21°F (-6°C) | 1.0 in | Coldest |
| February | 26°F (-3°C) | 0.9 in | Driest |
| March | 38°F (3°C) | 2.2 in | |
| April | 50°F (10°C) | 3.7 in | |
| May | 62°F (16°C) | 4.0 in | |
| June | 71°F (22°C) | 4.1 in | |
| July | 74°F (23°C) | 4.5 in | Warmest, Wettest |
| August | 73°F (23°C) | 4.1 in | |
| September | 65°F (18°C) | 4.1 in | |
| October | 53°F (12°C) | 2.8 in | |
| November | 38°F (3°C) | 2.4 in | |
| December | 26°F (-4°C) | 1.4 in |
Thornburg has a seasonal temperature swing of 53°F / from 21°F in January to 74°F in July. Total annual precipitation is 35.1 inches, with July being the wettest month (4.5") and February the driest (0.9").