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Weather & Climate in Unionville, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Unionville experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 21°F in January while summers reach 69°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 33.1 inches. The area receives 42.5 inches of snow annually, making winter weather a significant factor for residents. Air quality is rated Good with a median AQI of 38. The city sits at an elevation of 620 feet.
Temperature
21°F Jan (-6°C)
69°F Jul (20°C)
| Annual Average | 45.8°F |
| 15% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 69°F (20°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 620 ft (189 m) |
| Area | 0.9 sq mi (2.4 km²) |
| Population Density | 667/sq mi |
| Coordinates | 43.6535°N, 83.4671°W |
| Timezone | America/Detroit |
| County | Tuscola County County |
| Nearest Airport | Mbs International (MBS) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 73.1 / 100 |
| Social Vulnerability | 59.3 / 100 |
| Community Resilience | 80.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 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 | 132 km | 5 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 118 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
248 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 127 fatalities, 1,060 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 8, 1953 | EF5 | 69 km | 18.9 mi | 116 |
| May 12, 1956 | EF4 | 75 km | 6.6 mi | 3 |
| Jun 8, 1953 | EF4 | 61 km | 33.8 mi | 0 |
| Jul 2, 1997 | EF3 | 54 km | 1.7 mi | 1 |
| Jul 2, 1997 | EF3 | 58 km | 2.0 mi | 0 |
| Jun 21, 1996 | EF3 | 43 km | 1.0 mi | 0 |
| Mar 27, 1991 | EF3 | 85 km | 35.0 mi | 0 |
| Sep 2, 1984 | EF3 | 75 km | 15.6 mi | 0 |
| Aug 8, 1984 | EF3 | 75 km | 0.8 mi | 0 |
| Jun 12, 1984 | EF3 | 38 km | 48.0 mi | 0 |
| Mar 30, 1976 | EF3 | 80 km | 11.4 mi | 0 |
| Mar 30, 1976 | EF3 | 78 km | 6.4 mi | 1 |
| Jul 14, 1974 | EF3 | 67 km | 1.0 mi | 0 |
| Feb 28, 2024 | EF2 | 83 km | 5.7 mi | 0 |
| Jun 26, 2021 | EF2 | 53 km | 6.8 mi | 0 |
| Jun 22, 2015 | EF2 | 50 km | 11.3 mi | 0 |
| May 28, 2013 | EF2 | 85 km | 4.6 mi | 0 |
| May 28, 2013 | EF2 | 93 km | 5.1 mi | 0 |
| Mar 15, 2012 | EF2 | 59 km | 4.6 mi | 0 |
| May 31, 1999 | EF2 | 61 km | 1.8 mi | 0 |
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 | - | 106 km |
Source: NOAA/NCEI Historical Tsunami Database.
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BRITTLE (5,912 acres, 2021).
| Year | Name | Acres Burned | Distance |
| 2021 | BRITTLE | 5,912 | 86 km |
| 2014 | UNNAMED | 3,759 | 88 km |
| 2018 | BRITTLE 04/30/2018 | 3,484 | 88 km |
| 2019 | UNNAMED | 2,349 | 89 km |
| 2016 | UNNAMED | 1,796 | 90 km |
| 2021 | UNNAMED | 1,751 | 85 km |
| 1984 | RIVER ROAD | 1,693 | 85 km |
| 2017 | BRITTLE 20 AND 23 RX | 1,557 | 86 km |
| 2015 | UNNAMED | 1,434 | 88 km |
| 2015 | UNNAMED | 1,276 | 90 km |
| 2016 | UNNAMED | 1,217 | 85 km |
| 2015 | UNNAMED | 1,168 | 84 km |
| 2010 | BRITTLE FUELS BLOCK 10 | 1,076 | 90 km |
| 2016 | MEMORABLE RX | 946 | 88 km |
| 2018 | BRITTLE 05/05/2018 | 867 | 87 km |
| 2019 | UNNAMED | 642 | 86 km |
| 2007 | GALION | 637 | 78 km |
| 2019 | UNNAMED | 564 | 91 km |
| 2019 | MEMORABLE MIDDLE | 550 | 87 km |
| 2019 | CORSAIR BLOCK 8 | 541 | 79 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.3 in | Coldest |
| February | 22°F (-5°C) | 1.1 in | Driest |
| March | 32°F (0°C) | 2.0 in | |
| April | 44°F (7°C) | 2.5 in | |
| May | 56°F (13°C) | 2.6 in | |
| June | 66°F (19°C) | 3.1 in | |
| July | 69°F (20°C) | 2.6 in | Warmest |
| August | 68°F (20°C) | 3.1 in | |
| September | 61°F (16°C) | 3.9 in | Wettest |
| October | 50°F (10°C) | 2.4 in | |
| November | 39°F (4°C) | 2.4 in | |
| December | 27°F (-3°C) | 1.9 in |
Unionville has a seasonal temperature swing of 48°F / from 21°F in January to 69°F in July. Total annual precipitation is 28.9 inches, with September being the wettest month (3.9") and February the driest (1.1").