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Dewey, MT
Full City Profile · Montana · Silver Bow County County
2.0
/5.0
C
Fair
27
Population
104/sq mi density
$32,500
Median Income
$24,704 per capita
41°F
Avg Temperature
311 sunny days/yr
236
Violent Crime/100K
826 property/100K
C
Overall
2.0 / 5.0
Fair overall score based on economy, affordability, safety and education
C
Economy
2.2 / 5.0
$32,500 median income, 3.7% unemployment
F
Safety
1.0 / 5.0
236 violent crimes/100K
C+
Education
2.8 / 5.0
22.2% bachelor's degree or higher
Dewey has a cool climate with an average annual temperature of 41°F (5°C). Winters average 22°F in January while summers reach 64°F in July. The area gets 311 sunny days per year. Annual precipitation totals 11.3 inches. The area receives 15.2 inches of snow annually. Air quality is rated Good with a median AQI of 26.
Temperature
22°F Jan (-6°C)
64°F Jul (18°C)
| Annual Average | 41.0°F |
| 24% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 311 days/yr |
Geography
| Elevation | 5,502 ft (1,677 m) |
| Area | 0.3 sq mi (0.7 km²) |
| Population Density | 104/sq mi |
| Coordinates | 45.7754°N, 112.8529°W |
| Timezone | America/Denver |
| County | Silver Bow County County |
| Nearest Airport | Helena Regional (HLN) 71 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| PM2.5 (Fine Particles) | 8.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 38.0 / 100 |
| Social Vulnerability | 17.0 / 100 |
| Community Resilience | 62.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 0.7 in | |
| February | 22°F (-6°C) | 0.5 in | Driest |
| March | 26°F (-3°C) | 0.8 in | |
| April | 33°F (1°C) | 1.1 in | |
| May | 41°F (5°C) | 2.0 in | |
| June | 49°F (10°C) | 2.2 in | Wettest |
| July | 64°F (18°C) | 1.3 in | Warmest |
| August | 55°F (13°C) | 1.5 in | |
| September | 47°F (8°C) | 1.4 in | |
| October | 38°F (3°C) | 0.8 in | |
| November | 27°F (-3°C) | 0.8 in | |
| December | 19°F (-7°C) | 0.8 in | Coldest |
Dewey has a seasonal temperature swing of 45°F / from 19°F in December to 64°F in July. Total annual precipitation is 13.8 inches, with June being the wettest month (2.2") and February the driest (0.5").