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Weather & Climate in Grand Blanc, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grand Blanc experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 23°F in January while summers reach 70°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 32.2 inches. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 845 feet.
Temperature
23°F Jan (-5°C)
70°F Jul (21°C)
| Annual Average | 47.5°F |
| 12% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 845 ft (258 m) |
| Area | 3.6 sq mi (9.4 km²) |
| Population Density | 2,215/sq mi |
| Coordinates | 42.9325°N, 83.6205°W |
| Timezone | America/Detroit |
| County | Oakland County County |
| Nearest Airport | Bishop International (FNT) 6 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.5 / 100 |
| Social Vulnerability | 16.6 / 100 |
| Community Resilience | 90.4 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Very High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | No Rating |
| Cold Wave | Very High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
9 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.5.
| Sep 2, 1994 | 5 km SSW of DeWitt, Michigan | M3.5 | 82 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 103 km | 3 km |
| Jun 30, 2015 | 5 km NNE of Burlington, Michigan | M3.3 | 146 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 130 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 146 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 133 km | 5 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 127 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 97 km | 18 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 96 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
402 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 151 fatalities, 1,699 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 8, 1953 | EF5 | 26 km | 18.9 mi | 116 |
| Mar 20, 1976 | EF4 | 49 km | 3.8 mi | 1 |
| Apr 21, 1967 | EF4 | 96 km | 12.0 mi | 0 |
| Apr 11, 1965 | EF4 | 84 km | 21.0 mi | 1 |
| May 8, 1964 | EF4 | 71 km | 3.3 mi | 11 |
| Jul 4, 1957 | EF4 | 47 km | 29.9 mi | 0 |
| May 12, 1956 | EF4 | 9 km | 6.6 mi | 3 |
| May 12, 1956 | EF4 | 83 km | 6.8 mi | 0 |
| Jun 8, 1953 | EF4 | 43 km | 33.8 mi | 0 |
| May 21, 1953 | EF4 | 83 km | 10.0 mi | 2 |
| Mar 15, 2012 | EF3 | 66 km | 7.6 mi | 0 |
| Jul 2, 1997 | EF3 | 28 km | 1.7 mi | 1 |
| Jul 2, 1997 | EF3 | 28 km | 2.0 mi | 0 |
| Jun 21, 1996 | EF3 | 45 km | 1.0 mi | 0 |
| Sep 14, 1990 | EF3 | 52 km | 24.0 mi | 0 |
| Sep 2, 1984 | EF3 | 75 km | 15.6 mi | 0 |
| Aug 8, 1984 | EF3 | 10 km | 0.8 mi | 0 |
| Jun 12, 1984 | EF3 | 76 km | 48.0 mi | 0 |
| May 2, 1983 | EF3 | 77 km | 23.0 mi | 0 |
| Jun 15, 1982 | EF3 | 89 km | 13.0 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 1.5 m (5 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1952 | LAKE HURON, MI | Avalanche | 1.5 m | — | 101 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.4 in | Coldest |
| February | 24°F (-5°C) | 1.3 in | Driest |
| March | 34°F (1°C) | 2.1 in | |
| April | 45°F (7°C) | 2.8 in | |
| May | 57°F (14°C) | 2.7 in | |
| June | 66°F (19°C) | 3.3 in | |
| July | 70°F (21°C) | 2.6 in | Warmest |
| August | 69°F (20°C) | 3.3 in | |
| September | 61°F (16°C) | 3.4 in | Wettest |
| October | 50°F (10°C) | 2.2 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.1 in |
Grand Blanc has a seasonal temperature swing of 48°F / from 23°F in January to 70°F in July. Total annual precipitation is 29.9 inches, with September being the wettest month (3.4") and February the driest (1.3").