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Weather & Climate in Brown City, MI
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Brown City has a cool climate with an average annual temperature of 45°F (7°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 31.3 inches. The area receives 40.7 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 816 feet.
Temperature
21°F Jan (-6°C)
69°F Jul (21°C)
| Annual Average | 45.4°F |
| 16% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 816 ft (249 m) |
| Area | 1.1 sq mi (2.8 km²) |
| Population Density | 1,072/sq mi |
| Coordinates | 43.2115°N, 82.9884°W |
| Timezone | America/Detroit |
| County | Sanilac County County |
| Nearest Airport | St Clair County International (PHN) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 70.3 / 100 |
| Social Vulnerability | 72.0 / 100 |
| Community Resilience | 68.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
7 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 | 139 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 122 km | 3 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 126 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 129 km | 5 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 150 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 117 km | 18 km |
| May 23, 2022 | 2 km NNW of Corunna, Canada | M2.5 | 56 km | 5 km |
| Feb 17, 2013 | 31 km E of Leamington, Canada | M2.5 | 147 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
250 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 140 fatalities, 1,539 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 8, 1953 | EF5 | 71 km | 18.9 mi | 116 |
| Mar 20, 1976 | EF4 | 85 km | 3.8 mi | 1 |
| May 8, 1964 | EF4 | 62 km | 3.3 mi | 11 |
| Jul 4, 1957 | EF4 | 98 km | 29.9 mi | 0 |
| May 12, 1956 | EF4 | 61 km | 6.6 mi | 3 |
| Jun 8, 1953 | EF4 | 17 km | 33.8 mi | 0 |
| May 21, 1953 | EF4 | 45 km | 10.0 mi | 2 |
| Jul 2, 1997 | EF3 | 60 km | 2.0 mi | 0 |
| Jul 2, 1997 | EF3 | 51 km | 1.7 mi | 1 |
| Jun 21, 1996 | EF3 | 63 km | 1.0 mi | 0 |
| Sep 14, 1990 | EF3 | 90 km | 24.0 mi | 0 |
| Sep 2, 1984 | EF3 | 17 km | 15.6 mi | 0 |
| Aug 8, 1984 | EF3 | 62 km | 0.8 mi | 0 |
| Jun 12, 1984 | EF3 | 86 km | 48.0 mi | 0 |
| May 2, 1983 | EF3 | 85 km | 23.0 mi | 0 |
| Mar 20, 1976 | EF3 | 57 km | 17.1 mi | 1 |
| Jul 14, 1974 | EF3 | 49 km | 1.0 mi | 0 |
| Aug 2, 1972 | EF3 | 86 km | 0.1 mi | 0 |
| Nov 20, 1957 | EF3 | 91 km | 1.5 mi | 1 |
| Jun 8, 1953 | EF3 | 91 km | 9.1 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 | - | 49 km |
Source: NOAA/NCEI Historical Tsunami Database.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.5 in | Coldest |
| February | 22°F (-5°C) | 1.2 in | Driest |
| March | 32°F (0°C) | 2.0 in | |
| April | 43°F (6°C) | 2.5 in | |
| May | 55°F (13°C) | 2.5 in | |
| June | 65°F (18°C) | 3.2 in | |
| July | 69°F (21°C) | 2.7 in | Warmest |
| August | 68°F (20°C) | 3.0 in | |
| September | 61°F (16°C) | 3.4 in | Wettest |
| October | 50°F (10°C) | 2.5 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.1 in |
Brown City has a seasonal temperature swing of 48°F / from 21°F in January to 69°F in July. Total annual precipitation is 29.3 inches, with September being the wettest month (3.4") and February the driest (1.2").