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Weather & Climate in Iron Mountain, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Iron Mountain has a cool climate with an average annual temperature of 42°F (5°C). Winters average 15°F in January while summers reach 67°F in July. The area gets 276 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 20.8 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 1,165 feet.
Temperature
15°F Jan (-10°C)
67°F Jul (20°C)
| Annual Average | 41.8°F |
| 23% below US avg | |
| January Average | 15°F (-10°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 276 days/yr |
Geography
| Elevation | 1,165 ft (355 m) |
| Area | 8.0 sq mi (20.8 km²) |
| Population Density | 996/sq mi |
| Coordinates | 45.8269°N, 88.0594°W |
| Timezone | America/Detroit |
| County | Florence County County |
| Nearest Airport | Marquette/Sawyer Regional (MQT) 45 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 54.2 / 100 |
| Social Vulnerability | 41.2 / 100 |
| Community Resilience | 46.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.5.
| Jan 7, 2024 | 3 km NE of Mole Lake, Wisconsin | M2.5 | 78 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
82 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 4 fatalities, 28 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Aug 19, 1968 | EF4 | 83 km | 21.8 mi | 2 |
| May 28, 1991 | EF3 | 46 km | 10.0 mi | 0 |
| Jul 11, 1987 | EF3 | 16 km | 71.0 mi | 0 |
| Jul 4, 1986 | EF3 | 12 km | 24.3 mi | 0 |
| Jun 15, 2022 | EF2 | 52 km | 1.9 mi | 0 |
| Apr 10, 2011 | EF2 | 63 km | 12.0 mi | 0 |
| May 30, 1994 | EF2 | 74 km | 12.0 mi | 0 |
| Jul 19, 1992 | EF2 | 81 km | 0.2 mi | 0 |
| May 28, 1991 | EF2 | 26 km | 12.0 mi | 0 |
| Jun 14, 1981 | EF2 | 29 km | 2.6 mi | 0 |
| Jun 13, 1981 | EF2 | 86 km | 0.1 mi | 0 |
| Apr 21, 1974 | EF2 | 61 km | 2.7 mi | 0 |
| Sep 16, 1972 | EF2 | 68 km | 66.2 mi | 0 |
| Jul 20, 1972 | EF2 | 74 km | 0.8 mi | 0 |
| Aug 22, 1968 | EF2 | 97 km | 0.3 mi | 0 |
| Jun 30, 1968 | EF2 | 53 km | 1.0 mi | 0 |
| Jun 4, 1966 | EF2 | 93 km | 5.4 mi | 0 |
| Jun 4, 1966 | EF2 | 100 km | 4.9 mi | 0 |
| Jun 9, 1964 | EF2 | 81 km | 3.0 mi | 0 |
| Jul 8, 1959 | EF2 | 7 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
8 wildfires (100+ acres) recorded within 100 km. Largest: MARQUETTE9 (4,224 acres, 1999).
| Year | Name | Acres Burned | Distance |
| 1999 | MARQUETTE9 | 4,224 | 74 km |
| 1986 | MARQUETTE11 | 3,983 | 76 km |
| 1986 | MARQUETTE13 | 2,491 | 66 km |
| 2007 | BARAGA BUMP | 1,047 | 94 km |
| 2009 | FALLS | 820 | 68 km |
| 1986 | MARQUETTE10 | 671 | 67 km |
| 2019 | DUTCH MILL | 551 | 89 km |
| 1986 | MARQUETTE9 | 521 | 71 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 15°F (-10°C) | 1.3 in | Coldest |
| February | 16°F (-9°C) | 0.9 in | Driest |
| March | 26°F (-3°C) | 1.8 in | |
| April | 39°F (4°C) | 2.2 in | |
| May | 53°F (11°C) | 3.2 in | |
| June | 62°F (17°C) | 3.5 in | |
| July | 67°F (20°C) | 3.5 in | Warmest |
| August | 65°F (18°C) | 3.7 in | |
| September | 57°F (14°C) | 3.7 in | Wettest |
| October | 45°F (7°C) | 2.6 in | |
| November | 32°F (-0°C) | 2.1 in | |
| December | 19°F (-7°C) | 1.5 in |
Iron Mountain has a seasonal temperature swing of 53°F / from 15°F in January to 67°F in July. Total annual precipitation is 29.8 inches, with September being the wettest month (3.7") and February the driest (0.9").