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Weather & Climate in Copper Harbor, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Copper Harbor has a cool climate with an average annual temperature of 41°F (5°C). Winters average 17°F in January while summers reach 64°F in July. The area gets 249 sunny days per year, above the national average. Annual precipitation totals 33.1 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 615 feet.
Temperature
17°F Jan (-8°C)
64°F Jul (18°C)
| Annual Average | 40.8°F |
| 24% below US avg | |
| January Average | 17°F (-8°C) |
| July Average | 64°F (18°C) |
| Sunny Days | 249 days/yr |
Geography
| Elevation | 615 ft (187 m) |
| Area | 0.9 sq mi (2.4 km²) |
| Population Density | 89/sq mi |
| Coordinates | 47.4679°N, 87.8699°W |
| Timezone | America/Detroit |
| County | Keweenaw County County |
| Nearest Airport | Marquette/Sawyer Regional (MQT) 84 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 0.7 / 100 |
| Social Vulnerability | 97.1 / 100 |
| Community Resilience | 88.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | No Rating |
| Earthquake | No Rating |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tornado History
6 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2.
| Date | Rating | Distance | Path | Fatalities |
| Aug 22, 1968 | EF2 | 97 km | 0.3 mi | 0 |
| Jun 8, 2012 | EF1 | 77 km | 7.8 mi | 0 |
| Aug 11, 2011 | EF0 | 100 km | 0.1 mi | 0 |
| Aug 28, 2003 | EF0 | 19 km | 0.1 mi | 0 |
| Jul 11, 1987 | EF0 | 42 km | 6.0 mi | 0 |
| Sep 8, 1980 | EF0 | 95 km | 0.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: PINERY (695 acres, 2009).
| Year | Name | Acres Burned | Distance |
| 2009 | PINERY | 695 | 87 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 17°F (-8°C) | 3.0 in | Coldest |
| February | 17°F (-8°C) | 1.9 in | |
| March | 26°F (-3°C) | 2.1 in | |
| April | 37°F (3°C) | 1.8 in | Driest |
| May | 48°F (9°C) | 2.6 in | |
| June | 57°F (14°C) | 2.8 in | |
| July | 64°F (18°C) | 2.9 in | Warmest |
| August | 63°F (17°C) | 3.1 in | |
| September | 55°F (13°C) | 3.4 in | Wettest |
| October | 44°F (7°C) | 3.1 in | |
| November | 32°F (0°C) | 2.7 in | |
| December | 22°F (-6°C) | 2.6 in |
Copper Harbor has a seasonal temperature swing of 47°F / from 17°F in January to 64°F in July. Total annual precipitation is 32.1 inches, with September being the wettest month (3.4") and April the driest (1.8").