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Weather & Climate in Napoleon, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Napoleon experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 25°F in January while summers reach 74°F in July. The area gets 275 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 37.3 inches. The area receives 24.7 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 673 feet.
Temperature
25°F Jan (-4°C)
74°F Jul (23°C)
| Annual Average | 50.2°F |
| 7% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 673 ft (205 m) |
| Area | 6.6 sq mi (17.0 km²) |
| Population Density | 1,379/sq mi |
| Coordinates | 41.3980°N, 84.1250°W |
| Timezone | America/New_York |
| County | Henry County County |
| Nearest Airport | Fort Wayne International (FWA) 63 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 33.8 / 100 |
| Social Vulnerability | 16.3 / 100 |
| Community Resilience | 90.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
18 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| May 2, 2015 | 5 km S of Galesburg, Michigan | M4.2 | 143 km | 4 km |
| Apr 20, 2018 | Michigan | M3.4 | 122 km | 3 km |
| Jun 30, 2015 | 5 km NNE of Burlington, Michigan | M3.3 | 113 km | 5 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 121 km | 5 km |
| Jan 26, 2012 | 5 km NE of Topeka, Indiana | M3.0 | 115 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 113 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 106 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 73 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 148 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 69 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 56 km | 6 km |
| Jun 12, 2015 | 6 km NW of Convoy, Ohio | M2.6 | 73 km | 5 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 57 km | 6 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 101 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 122 km | 18 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 53 km | 5 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 92 km | 5 km |
| Feb 7, 2016 | 6 km W of Put-in-Bay, Ohio | M2.5 | 106 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
445 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 129 fatalities, 1,908 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 5, 2010 | EF4 | 52 km | 8.8 mi | 7 |
| Nov 10, 2002 | EF4 | 87 km | 52.8 mi | 4 |
| Feb 18, 1992 | EF4 | 83 km | 2.8 mi | 0 |
| Apr 11, 1965 | EF4 | 85 km | 80.5 mi | 21 |
| Apr 11, 1965 | EF4 | 67 km | 32.5 mi | 13 |
| Apr 11, 1965 | EF4 | 53 km | 5.6 mi | 18 |
| Apr 11, 1965 | EF4 | 95 km | 90.3 mi | 23 |
| Jun 8, 1953 | EF4 | 63 km | 5.4 mi | 4 |
| Jun 8, 1953 | EF4 | 27 km | 118.0 mi | 17 |
| Mar 14, 2024 | EF3 | 98 km | 31.3 mi | 3 |
| Aug 24, 2016 | EF3 | 72 km | 5.2 mi | 0 |
| Nov 10, 2002 | EF3 | 86 km | 21.0 mi | 1 |
| Oct 24, 2001 | EF3 | 63 km | 32.0 mi | 0 |
| Mar 27, 1991 | EF3 | 53 km | 5.0 mi | 0 |
| Mar 27, 1991 | EF3 | 80 km | 21.0 mi | 1 |
| May 15, 1986 | EF3 | 92 km | 1.2 mi | 0 |
| May 2, 1983 | EF3 | 26 km | 5.0 mi | 1 |
| Apr 3, 1974 | EF3 | 47 km | 8.7 mi | 0 |
| Apr 3, 1974 | EF3 | 67 km | 0.3 mi | 0 |
| May 10, 1973 | EF3 | 61 km | 50.1 mi | 6 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.8 in | Coldest |
| February | 26°F (-3°C) | 1.7 in | Driest |
| March | 37°F (3°C) | 2.7 in | |
| April | 48°F (9°C) | 3.4 in | |
| May | 60°F (15°C) | 3.5 in | |
| June | 69°F (20°C) | 3.6 in | Wettest |
| July | 74°F (23°C) | 3.5 in | Warmest |
| August | 70°F (21°C) | 3.4 in | |
| September | 64°F (18°C) | 3.0 in | |
| October | 52°F (11°C) | 2.5 in | |
| November | 40°F (5°C) | 2.9 in | |
| December | 29°F (-2°C) | 2.5 in |
Napoleon has a seasonal temperature swing of 48°F / from 25°F in January to 74°F in July. Total annual precipitation is 34.5 inches, with June being the wettest month (3.6") and February the driest (1.7").