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
C
Overall
2.0 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Economy
1.3 / 5.0
$32,500 median income, 10.0% unemployment
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. Annual precipitation totals 11.3 inches. The area receives 15.2 inches of snow annually.
Temperature
22°F Jan (-6°C)
64°F Jul (18°C)
| Annual Average | 40.9°F |
| 24% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 64°F (18°C) |
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
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) | 0.3 in | Driest |
| February | 24°F (-5°C) | 0.6 in | |
| March | 32°F (0°C) | 0.7 in | |
| April | 39°F (4°C) | 0.9 in | |
| May | 48°F (9°C) | 1.8 in | |
| June | 56°F (13°C) | 2.1 in | Wettest |
| July | 64°F (18°C) | 1.1 in | Warmest |
| August | 62°F (17°C) | 1.0 in | |
| September | 53°F (12°C) | 1.1 in | |
| October | 42°F (6°C) | 0.8 in | |
| November | 29°F (-1°C) | 0.5 in | |
| December | 20°F (-7°C) | 0.5 in | Coldest |
Dewey has a seasonal temperature swing of 44°F / from 20°F in December to 64°F in July. Total annual precipitation is 11.3 inches, with June being the wettest month (2.1") and January the driest (0.3").