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St. Marie, MT
Full City Profile · Montana · Valley County County
2.1
/5.0
C
Fair
319
Population
14/sq mi density
$38,125
Median Income
$16,802 per capita
44°F
Avg Temperature
200 sunny days/yr
147
Violent Crime/100K
1,674 property/100K
C
Overall
2.1 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Economy
2.6 / 5.0
$38,125 median income, 4.9% unemployment
F
Safety
1.0 / 5.0
147 violent crimes/100K
C+
Education
2.7 / 5.0
21.8% bachelor's degree or higher
St. Marie has a cool climate with an average annual temperature of 44°F (7°C). Winters average 14°F in January while summers reach 72°F in July. The area gets 200 sunny days per year. Air quality is rated Good with a median AQI of 26.
Temperature
14°F Jan (-10°C)
72°F Jul (22°C)
| Annual Average | 44.3°F |
| 18% below US avg | |
| January Average | 14°F (-10°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 200 days/yr |
Geography
| Elevation | 2,728 ft (831 m) |
| Area | 22.9 sq mi (59.3 km²) |
| Population Density | 14/sq mi |
| Coordinates | 48.4053°N, 106.4986°W |
| Timezone | America/Denver |
| County | Valley County County |
| Nearest Airport | Sidney-Richland Regional (SDY) 117 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 35.9 / 100 |
| Social Vulnerability | 40.2 / 100 |
| Community Resilience | 45.3 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 14°F (-10°C) | 0.3 in | Coldest |
| February | 19°F (-7°C) | 0.2 in | Driest |
| March | 31°F (-1°C) | 0.4 in | |
| April | 44°F (7°C) | 0.8 in | |
| May | 56°F (13°C) | 1.9 in | |
| June | 65°F (19°C) | 2.3 in | Wettest |
| July | 72°F (22°C) | 1.9 in | Warmest |
| August | 70°F (21°C) | 1.3 in | |
| September | 58°F (14°C) | 1.1 in | |
| October | 46°F (8°C) | 0.6 in | |
| November | 28°F (-2°C) | 0.3 in | |
| December | 15°F (-10°C) | 0.3 in |
St. Marie has a seasonal temperature swing of 58°F / from 14°F in January to 72°F in July. Total annual precipitation is 11.3 inches, with June being the wettest month (2.3") and February the driest (0.2").