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Weather & Climate in Castalia, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Castalia experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 28°F in January while summers reach 75°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 34.0 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 631 feet.
Temperature
28°F Jan (-2°C)
75°F Jul (24°C)
| Annual Average | 52.0°F |
| 4% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 631 ft (192 m) |
| Area | 1.1 sq mi (2.7 km²) |
| Population Density | 1,322/sq mi |
| Coordinates | 41.4042°N, 82.8016°W |
| Timezone | America/New_York |
| County | Erie County County |
| Nearest Airport | Mansfield Lahm Regional (MFD) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 61.4 / 100 |
| Social Vulnerability | 50.0 / 100 |
| Community Resilience | 99.2 / 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 | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
36 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.0.
| Jun 10, 2019 | 1 km NW of Timberlake, Ohio | M4.0 | 116 km | 2 km |
| Mar 12, 2007 | Ohio | M3.7 | 120 km | 5 km |
| Jun 30, 2003 | 6 km NW of Perry, Ohio | M3.6 | 140 km | 5 km |
| Mar 15, 1992 | 15 km NW of North Perry, Ohio | M3.5 | 141 km | 5 km |
| Jun 20, 2006 | 9 km WNW of North Perry, Ohio | M3.5 | 139 km | 5 km |
| Apr 20, 2018 | Michigan | M3.4 | 81 km | 3 km |
| Jan 26, 1991 | 1 km NNE of Mayfield Heights, Ohio | M3.4 | 113 km | 5 km |
| Jun 30, 2004 | 2 km WNW of Madison, Ohio | M3.3 | 149 km | 5 km |
| Jul 1, 2013 | 5 km NNW of Fairport Harbor, Ohio | M3.2 | 133 km | 5 km |
| Mar 11, 2006 | 8 km NNW of Mentor-on-the-Lake, Ohio | M3.1 | 125 km | 5 km |
| Jan 9, 2008 | 6 km WNW of Mentor-on-the-Lake, Ohio | M3.1 | 119 km | 5 km |
| Apr 25, 2010 | 2 km WNW of Madison, Ohio | M3.0 | 149 km | 5 km |
| Feb 23, 2011 | 18 km NE of Leamington, Canada | M3.0 | 89 km | 5 km |
| Jun 5, 2011 | 5 km W of Lodi, Ohio | M3.0 | 73 km | 5 km |
| Aug 7, 2000 | 2 km S of Limaville, Ohio | M2.9 | 147 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 130 km | 5 km |
| Jan 4, 2022 | 3 km NW of Timberlake, Ohio | M2.8 | 115 km | 5 km |
| Sep 22, 1999 | 16 km NW of Mentor-on-the-Lake, Ohio | M2.8 | 120 km | 18 km |
| Apr 12, 2007 | 11 km NW of Put-in-Bay, Ohio | M2.8 | 37 km | 5 km |
| Apr 28, 2002 | Ohio | M2.7 | 129 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
346 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 82 fatalities, 1,249 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 5, 2010 | EF4 | 64 km | 8.8 mi | 7 |
| Apr 11, 1965 | EF4 | 73 km | 5.6 mi | 18 |
| Apr 11, 1965 | EF4 | 50 km | 22.0 mi | 18 |
| Jun 8, 1953 | EF4 | 76 km | 5.4 mi | 4 |
| Jun 8, 1953 | EF4 | 94 km | 118.0 mi | 17 |
| Nov 10, 2002 | EF3 | 46 km | 21.0 mi | 1 |
| Jul 12, 1992 | EF3 | 70 km | 7.0 mi | 0 |
| May 2, 1983 | EF3 | 86 km | 5.0 mi | 1 |
| May 2, 1983 | EF3 | 97 km | 12.0 mi | 1 |
| Apr 3, 1974 | EF3 | 74 km | 0.3 mi | 0 |
| May 10, 1973 | EF3 | 56 km | 50.1 mi | 6 |
| Apr 11, 1965 | EF3 | 46 km | 15.0 mi | 4 |
| Apr 17, 1963 | EF3 | 72 km | 0.5 mi | 0 |
| Mar 14, 2024 | EF2 | 48 km | 10.3 mi | 0 |
| Jun 15, 2023 | EF2 | 72 km | 3.8 mi | 0 |
| Jun 15, 2023 | EF2 | 30 km | 3.4 mi | 0 |
| Jun 15, 2023 | EF2 | 22 km | 8.7 mi | 0 |
| Apr 14, 2019 | EF2 | 64 km | 17.0 mi | 0 |
| Nov 5, 2017 | EF2 | 29 km | 0.6 mi | 0 |
| Nov 5, 2017 | EF2 | 75 km | 1.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 1.9 in | |
| February | 27°F (-3°C) | 1.7 in | Coldest, Driest |
| March | 37°F (3°C) | 2.6 in | |
| April | 48°F (9°C) | 3.1 in | |
| May | 59°F (15°C) | 3.5 in | |
| June | 69°F (20°C) | 4.0 in | Wettest |
| July | 75°F (24°C) | 3.7 in | Warmest |
| August | 71°F (22°C) | 3.6 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 53°F (12°C) | 2.2 in | |
| November | 42°F (5°C) | 2.9 in | |
| December | 31°F (-1°C) | 2.6 in |
Castalia has a seasonal temperature swing of 48°F / from 27°F in February to 75°F in July. Total annual precipitation is 35.0 inches, with June being the wettest month (4.0") and February the driest (1.7").