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Thornhill, KY
Full City Profile · Kentucky · Jefferson County County
4.4
/5.0
A
Great
163
Population
3,260/sq mi density
$151,250
Median Income
$68,210 per capita
$413,000
Home Value
$612,615 Zillow
58°F
Avg Temperature
293 sunny days/yr
A
Overall
4.4 / 5.0
Strong
A+
Economy
4.9 / 5.0
$151,250 median income, 2.4% unemployment
A+
Affordability
5.0 / 5.0
$413,000 home value, /mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A+
Education
5.0 / 5.0
76.4% bachelor's degree or higher
Thornhill enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 35°F in January while summers reach 79°F in July. The area gets 293 sunny days per year. Annual precipitation totals 48.1 inches. Air quality is rated Good with a median AQI of 41.
Temperature
35°F Jan (2°C)
79°F Jul (26°C)
| Annual Average | 57.8°F |
| 7% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 570 ft (174 m) |
| Area | 0.1 sq mi (0.1 km²) |
| Population Density | 3,260/sq mi |
| Coordinates | 38.2877°N, 85.6250°W |
| Timezone | America/New_York |
| County | Jefferson County County |
| Nearest Airport | Louisville Muhammad Ali International (SDF) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0460 ppm |
| NO₂ (Nitrogen Dioxide) | 17.2 ppb |
| SO₂ (Sulfur Dioxide) | 0.86 ppb |
| CO (Carbon Monoxide) | 0.30 ppm |
| PM2.5 (Fine Particles) | 9.2 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.3 / 100 |
| Social Vulnerability | 54.9 / 100 |
| Community Resilience | 76.6 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 3.2 in | Coldest |
| February | 37°F (3°C) | 3.3 in | |
| March | 46°F (8°C) | 4.4 in | |
| April | 56°F (13°C) | 4.3 in | |
| May | 65°F (18°C) | 4.8 in | Wettest |
| June | 73°F (23°C) | 4.0 in | |
| July | 79°F (26°C) | 4.6 in | Warmest |
| August | 76°F (24°C) | 3.8 in | |
| September | 69°F (21°C) | 3.1 in | |
| October | 57°F (14°C) | 3.0 in | Driest |
| November | 47°F (8°C) | 3.9 in | |
| December | 37°F (3°C) | 4.0 in |
Thornhill has a seasonal temperature swing of 44°F / from 35°F in January to 79°F in July. Total annual precipitation is 46.3 inches, with May being the wettest month (4.8") and October the driest (3.0").