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Johnstown, CO
Full City Profile · Colorado · Weld County County
3.6
/5.0
B+
Good
18,075
Population
1,160/sq mi density
$130,851
Median Income
$48,568 per capita
$493,500
Home Value
$502,715 Zillow
$1,767
Median Rent
25.0% income on rent
52°F
Avg Temperature
316 sunny days/yr
109
Violent Crime/100K
1,872 property/100K
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$130,851 median income, 3.3% unemployment
A+
Affordability
4.6 / 5.0
$493,500 home value, $1,767/mo rent
F
Safety
1.0 / 5.0
109 violent crimes/100K
B+
Education
4.0 / 5.0
37.0% bachelor's degree or higher
Johnstown experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 31°F in January while summers reach 76°F in July. The area gets 316 sunny days per year. Annual precipitation totals 14.7 inches. The area receives 34.9 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
31°F Jan (-1°C)
76°F Jul (24°C)
| Annual Average | 52.1°F |
| 4% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 316 days/yr |
Geography
| Elevation | 4,840 ft (1,475 m) |
| Area | 13.6 sq mi (35.2 km²) |
| Population Density | 1,160/sq mi |
| Coordinates | 40.3072°N, 104.9112°W |
| Timezone | America/Denver |
| County | Weld County County |
| Nearest Airport | Northern Colorado Regional (FNL) 11 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0491 ppm |
| NO₂ (Nitrogen Dioxide) | 11.5 ppb |
| CO (Carbon Monoxide) | 0.20 ppm |
| PM2.5 (Fine Particles) | 7.7 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.2 / 100 |
| Social Vulnerability | 11.4 / 100 |
| Community Resilience | 56.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 0.5 in | |
| February | 33°F (0°C) | 0.4 in | Driest |
| March | 40°F (5°C) | 1.4 in | |
| April | 48°F (9°C) | 1.9 in | |
| May | 57°F (14°C) | 2.6 in | Wettest |
| June | 67°F (19°C) | 1.9 in | |
| July | 76°F (24°C) | 1.7 in | Warmest |
| August | 70°F (21°C) | 1.4 in | |
| September | 61°F (16°C) | 1.4 in | |
| October | 50°F (10°C) | 1.0 in | |
| November | 37°F (3°C) | 0.9 in | |
| December | 29°F (-2°C) | 0.5 in | Coldest |
Johnstown has a seasonal temperature swing of 47°F / from 29°F in December to 76°F in July. Total annual precipitation is 15.6 inches, with May being the wettest month (2.6") and February the driest (0.4").