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Thornton, CO
Full City Profile · Colorado · Denver County County
3.3
/5.0
B
Good
142,878
Population
3,912/sq mi density
$100,985
Median Income
$41,869 per capita
$482,200
Home Value
$497,741 Zillow
$1,810
Median Rent
32.6% income on rent
49°F
Avg Temperature
321 sunny days/yr
273
Violent Crime/100K
3,027 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$100,985 median income, 3.4% unemployment
B+
Affordability
4.0 / 5.0
$482,200 home value, $1,810/mo rent
F
Safety
1.0 / 5.0
273 violent crimes/100K
B+
Education
3.6 / 5.0
32.2% bachelor's degree or higher
Thornton experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 72°F in July. The area gets 321 sunny days per year. Annual precipitation totals 24.3 inches. The area receives 30.7 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
21°F Jan (-6°C)
72°F Jul (22°C)
| Annual Average | 48.7°F |
| 10% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 321 days/yr |
Geography
| Elevation | 5,197 ft (1,584 m) |
| Area | 36.0 sq mi (93.1 km²) |
| Population Density | 3,912/sq mi |
| Coordinates | 39.9204°N, 104.9414°W |
| Timezone | America/Denver |
| County | Denver County County |
| Nearest Airport | Denver International (DEN) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0480 ppm |
| NO₂ (Nitrogen Dioxide) | 26.5 ppb |
| SO₂ (Sulfur Dioxide) | 0.77 ppb |
| CO (Carbon Monoxide) | 0.36 ppm |
| PM2.5 (Fine Particles) | 6.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.2 / 100 |
| Social Vulnerability | 17.8 / 100 |
| Community Resilience | 68.5 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Very High |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 0.5 in | Coldest, Driest |
| February | 34°F (1°C) | 0.5 in | |
| March | 41°F (5°C) | 1.4 in | |
| April | 48°F (9°C) | 2.0 in | |
| May | 58°F (14°C) | 2.5 in | Wettest |
| June | 68°F (20°C) | 1.8 in | |
| July | 72°F (22°C) | 1.9 in | Warmest |
| August | 71°F (22°C) | 1.6 in | |
| September | 63°F (17°C) | 1.4 in | |
| October | 51°F (11°C) | 1.1 in | |
| November | 38°F (3°C) | 1.0 in | |
| December | 31°F (-1°C) | 0.6 in |
Thornton has a seasonal temperature swing of 52°F / from 21°F in January to 72°F in July. Total annual precipitation is 16.3 inches, with May being the wettest month (2.5") and January the driest (0.5").