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Weather & Climate in Helena, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Helena experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 27°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 34.9 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 697 feet.
Temperature
27°F Jan (-3°C)
74°F Jul (23°C)
| Annual Average | 50.9°F |
| 6% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 697 ft (212 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 979/sq mi |
| Coordinates | 41.3403°N, 83.2919°W |
| Timezone | America/New_York |
| County | Sandusky County County |
| Nearest Airport | Mansfield Lahm Regional (MFD) 54 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 56.7 / 100 |
| Social Vulnerability | 34.5 / 100 |
| Community Resilience | 87.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Very Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| 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
19 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.4.
| Apr 20, 2018 | Michigan | M3.4 | 90 km | 3 km |
| Jun 5, 2011 | 5 km W of Lodi, Ohio | M3.0 | 107 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 116 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 140 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 94 km | 5 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 52 km | 5 km |
| May 17, 2010 | 2 km S of Boston Heights, Ohio | M2.7 | 149 km | 5 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 6 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 80 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 29 km | 6 km |
| Jun 12, 2015 | 6 km NW of Convoy, Ohio | M2.6 | 130 km | 5 km |
| May 14, 2017 | 18 km ENE of Leamington, Canada | M2.6 | 115 km | 5 km |
| Mar 8, 2010 | 7 km ENE of Grosse Ile, Michigan | M2.5 | 93 km | 18 km |
| Feb 17, 2013 | 31 km E of Leamington, Canada | M2.5 | 116 km | 5 km |
| Feb 7, 2016 | 6 km W of Put-in-Bay, Ohio | M2.5 | 48 km | 5 km |
| Sep 7, 2012 | 17 km ESE of Stony Point, Michigan | M2.5 | 61 km | 5 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 28 km | 6 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 40 km | 5 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 136 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
388 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 95 fatalities, 1,452 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 5, 2010 | EF4 | 31 km | 8.8 mi | 7 |
| Apr 11, 1965 | EF4 | 45 km | 5.6 mi | 18 |
| Apr 11, 1965 | EF4 | 88 km | 22.0 mi | 18 |
| Apr 11, 1965 | EF4 | 97 km | 32.5 mi | 13 |
| Jun 8, 1953 | EF4 | 54 km | 5.4 mi | 4 |
| Jun 8, 1953 | EF4 | 53 km | 118.0 mi | 17 |
| Nov 10, 2002 | EF3 | 29 km | 21.0 mi | 1 |
| May 2, 1983 | EF3 | 45 km | 5.0 mi | 1 |
| Jun 13, 1981 | EF3 | 99 km | 3.8 mi | 4 |
| Apr 3, 1974 | EF3 | 55 km | 0.3 mi | 0 |
| May 10, 1973 | EF3 | 17 km | 50.1 mi | 6 |
| Jun 2, 1971 | EF3 | 66 km | 39.6 mi | 0 |
| Jun 2, 1971 | EF3 | 76 km | 31.5 mi | 0 |
| Jul 4, 1969 | EF3 | 90 km | 13.9 mi | 0 |
| Apr 11, 1965 | EF3 | 33 km | 15.0 mi | 4 |
| Apr 17, 1963 | EF3 | 65 km | 0.5 mi | 0 |
| Jul 19, 1950 | EF3 | 96 km | 9.7 mi | 0 |
| Mar 14, 2024 | EF2 | 56 km | 10.3 mi | 0 |
| Jun 15, 2023 | EF2 | 48 km | 3.8 mi | 0 |
| Jun 15, 2023 | EF2 | 19 km | 3.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 1.8 in | Coldest |
| February | 27°F (-3°C) | 1.7 in | Driest |
| March | 37°F (3°C) | 2.6 in | |
| April | 48°F (9°C) | 3.1 in | |
| May | 60°F (15°C) | 3.4 in | |
| June | 69°F (21°C) | 3.8 in | Wettest |
| July | 74°F (23°C) | 3.5 in | Warmest |
| August | 71°F (22°C) | 3.5 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 52°F (11°C) | 2.2 in | |
| November | 41°F (5°C) | 2.8 in | |
| December | 30°F (-1°C) | 2.7 in |
Helena has a seasonal temperature swing of 47°F / from 27°F in January to 74°F in July. Total annual precipitation is 34.4 inches, with June being the wettest month (3.8") and February the driest (1.7").