Altona, CO
Full City Profile · Colorado · Boulder County County
4.5
/5.0
A+
Excellent
532
Population
315/sq mi density
$250,001
Median Income
$171,369 per capita
$1,168,400
Home Value
$534,532 Zillow
$3,501
Median Rent
51.0% income on rent
52°F
Avg Temperature
A+
Overall
4.5 / 5.0
Strong
A+
Economy
4.6 / 5.0
$250,001 median income, 4.8% unemployment
A
Affordability
4.0 / 5.0
$1,168,400 home value, $3,501/mo rent
A+
Education
5.0 / 5.0
71.3% bachelor's degree or higher
Altona experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 34°F in January while summers reach 73°F in July. Annual precipitation totals 21.2 inches. The area receives 92.8 inches of snow annually. Air quality is rated Good with a median AQI of 49.
Temperature
34°F Jan (1°C)
73°F Jul (23°C)
| Annual Average | 51.5°F |
| 5% below US avg | |
| January Average | 34°F (1°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 6,017 ft (1,834 m) |
| Area | 1.7 sq mi (4.5 km²) |
| Population Density | 315/sq mi |
| Coordinates | 40.1219°N, 105.2962°W |
| Timezone | America/Denver |
| County | Boulder County County |
| Nearest Airport | Northern Colorado Regional (FNL) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 49.0 |
| Rating | Good |
| Good Days % | 57.9% |
| Unhealthy Days | 10 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0497 ppm |
| PM2.5 (Fine Particles) | 5.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.7 / 100 |
| Social Vulnerability | 11.4 / 100 |
| Community Resilience | 91.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively High |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Very High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Volcano | Very Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 0.8 in | |
| February | 35°F (2°C) | 1.0 in | |
| March | 43°F (6°C) | 2.0 in | |
| April | 49°F (9°C) | 3.1 in | |
| May | 57°F (14°C) | 3.2 in | Wettest |
| June | 67°F (19°C) | 2.0 in | |
| July | 73°F (23°C) | 1.8 in | Warmest |
| August | 71°F (22°C) | 1.7 in | |
| September | 64°F (18°C) | 2.1 in | |
| October | 52°F (11°C) | 1.6 in | |
| November | 41°F (5°C) | 1.2 in | |
| December | 34°F (1°C) | 0.8 in | Coldest, Driest |
Altona has a seasonal temperature swing of 39°F / from 34°F in December to 73°F in July. Total annual precipitation is 21.2 inches, with May being the wettest month (3.2") and December the driest (0.8").