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St. Mary, MT
Full City Profile · Montana · Glacier County County
2.4
/5.0
C
Fair
209
Population
279/sq mi density
40°F
Avg Temperature
269 sunny days/yr
83
Violent Crime/100K
2,653 property/100K
C
Overall
2.4 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
83 violent crimes/100K
B+
Education
3.7 / 5.0
34.3% bachelor's degree or higher
St. Mary has a cool climate with an average annual temperature of 40°F (4°C). Winters average 23°F in January while summers reach 60°F in July. The area gets 269 sunny days per year. Annual precipitation totals 26.1 inches. Air quality is rated Good with a median AQI of 26.
Temperature
23°F Jan (-5°C)
60°F Jul (15°C)
| Annual Average | 39.5°F |
| 27% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 60°F (15°C) |
| Sunny Days | 269 days/yr |
Geography
| Elevation | 4,634 ft (1,412 m) |
| Area | 0.8 sq mi (1.9 km²) |
| Population Density | 279/sq mi |
| Coordinates | 48.7429°N, 113.4275°W |
| Timezone | America/Denver |
| County | Glacier County County |
| Nearest Airport | Glacier Park International (FCA) 48 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 26.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| PM2.5 (Fine Particles) | 4.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 51.5 / 100 |
| Social Vulnerability | 99.2 / 100 |
| Community Resilience | 28.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Avalanche | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.5 in | |
| February | 23°F (-5°C) | 1.3 in | Driest |
| March | 27°F (-3°C) | 1.5 in | |
| April | 35°F (2°C) | 1.9 in | |
| May | 44°F (7°C) | 2.9 in | |
| June | 52°F (11°C) | 3.3 in | Wettest |
| July | 60°F (15°C) | 1.7 in | Warmest |
| August | 58°F (14°C) | 1.9 in | |
| September | 49°F (10°C) | 2.0 in | |
| October | 40°F (5°C) | 1.3 in | |
| November | 28°F (-2°C) | 1.5 in | |
| December | 21°F (-6°C) | 1.4 in | Coldest |
St. Mary has a seasonal temperature swing of 39°F / from 21°F in December to 60°F in July. Total annual precipitation is 22.2 inches, with June being the wettest month (3.3") and February the driest (1.3").