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Weather & Climate in Custer, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Custer experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 23°F in January while summers reach 68°F in July. The area gets 261 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 674 feet.
Temperature
23°F Jan (-5°C)
68°F Jul (20°C)
| Annual Average | 46.0°F |
| 15% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 261 days/yr |
Geography
| Elevation | 674 ft (205 m) |
| Area | 1.0 sq mi (2.5 km²) |
| Population Density | 270/sq mi |
| Coordinates | 43.9511°N, 86.2196°W |
| Timezone | America/Detroit |
| County | Mason County County |
| Nearest Airport | Gerald R Ford International (GRR) 82 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 25.4 / 100 |
| Social Vulnerability | 79.7 / 100 |
| Community Resilience | 96.1 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | 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: M2.9.
| Aug 2, 2024 | 38 km ESE of Sturgeon Bay, Wisconsin | M2.9 | 99 km | 11 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
85 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 3 fatalities, 71 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 3, 1956 | EF4 | 48 km | 50.3 mi | 1 |
| Jun 26, 1969 | EF3 | 99 km | 6.4 mi | 0 |
| Apr 23, 1968 | EF3 | 66 km | 60.9 mi | 0 |
| May 28, 1991 | EF2 | 33 km | 3.0 mi | 0 |
| Mar 27, 1991 | EF2 | 86 km | 4.0 mi | 0 |
| Jun 8, 1985 | EF2 | 55 km | 24.0 mi | 0 |
| Aug 15, 1978 | EF2 | 51 km | 0.8 mi | 0 |
| Jun 17, 1975 | EF2 | 68 km | 1.5 mi | 1 |
| Jun 9, 1974 | EF2 | 66 km | 1.5 mi | 0 |
| Jun 7, 1974 | EF2 | 67 km | 1.2 mi | 0 |
| Apr 12, 1972 | EF2 | 15 km | 0.1 mi | 0 |
| Sep 9, 1968 | EF2 | 98 km | 1.0 mi | 0 |
| Apr 20, 1966 | EF2 | 81 km | 0.1 mi | 0 |
| Sep 4, 1965 | EF2 | 87 km | 0.1 mi | 0 |
| Sep 3, 1964 | EF2 | 91 km | 0.1 mi | 0 |
| Jul 31, 1963 | EF2 | 76 km | 19.6 mi | 0 |
| Sep 26, 1951 | EF2 | 34 km | 2.3 mi | 1 |
| Jun 26, 2021 | EF1 | 90 km | 2.9 mi | 0 |
| Aug 28, 2018 | EF1 | 32 km | 1.0 mi | 0 |
| Jun 12, 2008 | EF1 | 26 km | 1.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
10 wildfires (100+ acres) recorded within 100 km. Largest: GRANT RX (2,204 acres, 2017).
| Year | Name | Acres Burned | Distance |
| 2017 | GRANT RX | 2,204 | 21 km |
| 2021 | 21-SLBE LASSO LOOP BURN | 1,906 | 88 km |
| 2018 | SER 438 / WHITE RIVER | 814 | 51 km |
| 2003 | WARFIELD ROAD | 800 | 44 km |
| 2019 | UNNAMED | 793 | 50 km |
| 1994 | COUNTY LINE | 735 | 31 km |
| 2019 | BALDWIN FUELS UNITS 1/2/6AB | 619 | 26 km |
| 2019 | 19-SLBE PETERSON | 605 | 87 km |
| 2021 | WARFIELD | 538 | 44 km |
| 2024 | WHELAN LAKE BLOCK 1 PARTIAL 1 RX | 512 | 8 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 2.2 in | |
| February | 22°F (-5°C) | 1.5 in | Coldest, Driest |
| March | 31°F (-0°C) | 2.1 in | |
| April | 43°F (6°C) | 2.8 in | |
| May | 55°F (13°C) | 2.6 in | |
| June | 64°F (18°C) | 3.2 in | |
| July | 68°F (20°C) | 2.4 in | Warmest |
| August | 68°F (20°C) | 3.9 in | |
| September | 61°F (16°C) | 4.2 in | Wettest |
| October | 49°F (10°C) | 3.3 in | |
| November | 38°F (3°C) | 3.1 in | |
| December | 28°F (-3°C) | 2.6 in |
Custer has a seasonal temperature swing of 46°F / from 22°F in February to 68°F in July. Total annual precipitation is 33.8 inches, with September being the wettest month (4.2") and February the driest (1.5").