St. Mary, MT
Full City Profile · Montana · Glacier County County
3.7
/5.0
B+
Good
209
Population
279/sq mi density
40°F
Avg Temperature
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
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. Annual precipitation totals 26.1 inches. The area receives 115.2 inches of snow annually.
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) |
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
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) | 2.1 in | |
| February | 23°F (-5°C) | 2.1 in | Coldest |
| March | 29°F (-2°C) | 2.5 in | |
| April | 37°F (3°C) | 2.5 in | |
| May | 46°F (8°C) | 2.8 in | |
| June | 52°F (11°C) | 3.1 in | Wettest |
| July | 60°F (15°C) | 1.2 in | Warmest, Driest |
| August | 59°F (15°C) | 1.3 in | |
| September | 51°F (11°C) | 1.6 in | |
| October | 40°F (5°C) | 2.2 in | |
| November | 31°F (-1°C) | 2.7 in | |
| December | 24°F (-5°C) | 2.1 in |
St. Mary has a seasonal temperature swing of 37°F / from 23°F in February to 60°F in July. Total annual precipitation is 26.1 inches, with June being the wettest month (3.1") and July the driest (1.2").