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Longmont, CO
Full City Profile · Colorado · Boulder County County
3.4
/5.0
B
Good
98,958
Population
3,382/sq mi density
$89,724
Median Income
$47,338 per capita
$541,400
Home Value
$548,639 Zillow
$1,755
Median Rent
33.3% income on rent
47°F
Avg Temperature
309 sunny days/yr
431
Violent Crime/100K
2,602 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$89,724 median income, 3.0% unemployment
B
Affordability
3.3 / 5.0
$541,400 home value, $1,755/mo rent
F
Safety
1.0 / 5.0
431 violent crimes/100K (13% above avg)
A+
Education
4.7 / 5.0
46.3% bachelor's degree or higher
Longmont experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 24°F in January while summers reach 70°F in July. The area gets 309 sunny days per year. Annual precipitation totals 27.0 inches. The area receives 34.6 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
24°F Jan (-5°C)
70°F Jul (21°C)
| Annual Average | 47.3°F |
| 12% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 309 days/yr |
Geography
| Elevation | 4,990 ft (1,521 m) |
| Area | 27.7 sq mi (71.6 km²) |
| Population Density | 3,382/sq mi |
| Coordinates | 40.1699°N, 105.1018°W |
| Timezone | America/Denver |
| County | Boulder County County |
| Nearest Airport | Northern Colorado Regional (FNL) 20 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
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 | 24°F (-5°C) | 0.5 in | Coldest |
| February | 33°F (0°C) | 0.5 in | Driest |
| March | 40°F (4°C) | 1.5 in | |
| April | 47°F (9°C) | 2.1 in | |
| May | 57°F (14°C) | 2.6 in | Wettest |
| June | 66°F (19°C) | 1.9 in | |
| July | 70°F (21°C) | 1.8 in | Warmest |
| August | 70°F (21°C) | 1.4 in | |
| September | 61°F (16°C) | 1.5 in | |
| October | 50°F (10°C) | 1.0 in | |
| November | 37°F (3°C) | 1.0 in | |
| December | 29°F (-2°C) | 0.6 in |
Longmont has a seasonal temperature swing of 47°F / from 24°F in January to 70°F in July. Total annual precipitation is 16.3 inches, with May being the wettest month (2.6") and February the driest (0.5").