New Castle, CO
Full City Profile · Colorado · Garfield County County
3.3
/5.0
B
Good
4,878
Population
1,951/sq mi density
$88,421
Median Income
$39,321 per capita
$488,600
Home Value
$648,777 Zillow
$1,627
Median Rent
31.4% income on rent
49°F
Avg Temperature
124
Violent Crime/100K
680 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$88,421 median income, 1.3% unemployment
B+
Affordability
3.6 / 5.0
$488,600 home value, $1,627/mo rent
F
Safety
1.0 / 5.0
124 violent crimes/100K
B+
Education
3.9 / 5.0
36.4% bachelor's degree or higher
New Castle experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 25°F in January while summers reach 74°F in July. Annual precipitation totals 10.7 inches. The area receives 26.8 inches of snow annually. Air quality is rated Good with a median AQI of 49.
Temperature
25°F Jan (-4°C)
74°F Jul (23°C)
| Annual Average | 49.1°F |
| 9% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 74°F (23°C) |
Geography
| Elevation | 5,825 ft (1,775 m) |
| Area | 2.7 sq mi (7.0 km²) |
| Population Density | 1,951/sq mi |
| Coordinates | 39.5776°N, 107.5265°W |
| Timezone | America/Denver |
| County | Garfield County County |
| Nearest Airport | Eagle County Regional (EGE) 33 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 49.0 |
| Rating | Good |
| Good Days % | 59.0% |
| Unhealthy Days | 5 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0506 ppm |
| NO₂ (Nitrogen Dioxide) | 3.9 ppb |
| PM2.5 (Fine Particles) | 4.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.5 / 100 |
| Social Vulnerability | 15.4 / 100 |
| Community Resilience | 12.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Relatively High |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively High |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 0.7 in | Coldest |
| February | 32°F (-0°C) | 0.6 in | |
| March | 41°F (5°C) | 0.8 in | |
| April | 48°F (9°C) | 1.0 in | |
| May | 57°F (14°C) | 1.1 in | |
| June | 67°F (20°C) | 0.7 in | |
| July | 74°F (23°C) | 1.0 in | Warmest |
| August | 71°F (22°C) | 1.1 in | |
| September | 63°F (17°C) | 1.3 in | Wettest |
| October | 50°F (10°C) | 1.3 in | |
| November | 37°F (3°C) | 0.6 in | |
| December | 26°F (-4°C) | 0.6 in | Driest |
New Castle has a seasonal temperature swing of 49°F / from 25°F in January to 74°F in July. Total annual precipitation is 10.7 inches, with September being the wettest month (1.3") and December the driest (0.6").