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Weather & Climate in Delaware, OH
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Delaware 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 40.5 inches. The area receives 24.0 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 42. 83% of days have good air quality. The city sits at an elevation of 925 feet.
Temperature
28°F Jan (-2°C)
75°F Jul (24°C)
| Annual Average | 52.4°F |
| 3% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 925 ft (282 m) |
| Area | 19.1 sq mi (49.4 km²) |
| Population Density | 2,133/sq mi |
| Coordinates | 40.2865°N, 83.0749°W |
| Timezone | America/New_York |
| County | Delaware County County |
| Nearest Airport | John Glenn Columbus International (CMH) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
| Good Days % | 82.6% |
| Unhealthy Days | 1 |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 95.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very 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: M3.6.
| Feb 19, 1995 | 8 km SSE of Rocky Fork Point, Ohio | M3.6 | 134 km | 10 km |
| Nov 20, 2013 | 2 km SW of Buchtel, Ohio | M3.5 | 119 km | 8 km |
| May 24, 2017 | 1 km S of McArthur, Ohio | M3.4 | 128 km | 10 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 142 km | 5 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 138 km | 6 km |
| Jun 5, 2011 | 5 km W of Lodi, Ohio | M3.0 | 118 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 113 km | 5 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 138 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 99 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 139 km | 2 km |
| May 14, 2010 | 1 km ENE of Gibsonburg, Ohio | M2.7 | 124 km | 5 km |
| Nov 25, 1998 | 1 km SSW of New London, Ohio | M2.7 | 104 km | 5 km |
| May 20, 2023 | 3 km SSE of Walbridge, Ohio | M2.6 | 145 km | 6 km |
| Feb 11, 2015 | 8 km SE of Richmond Dale, Ohio | M2.6 | 130 km | 20 km |
| Mar 18, 2024 | 4 km WSW of Millbury, Ohio | M2.5 | 144 km | 6 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 102 km | 5 km |
| Jan 26, 2018 | 7 km NNW of Vincent, Ohio | M2.5 | 150 km | 11 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 140 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
431 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 19 fatalities, 519 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 14, 2024 | EF3 | 96 km | 31.3 mi | 3 |
| May 14, 2014 | EF3 | 94 km | 8.9 mi | 0 |
| Nov 10, 2002 | EF3 | 41 km | 9.0 mi | 0 |
| Nov 10, 2002 | EF3 | 91 km | 21.0 mi | 1 |
| Oct 13, 1999 | EF3 | 77 km | 3.6 mi | 0 |
| May 31, 1985 | EF3 | 33 km | 29.0 mi | 1 |
| Jun 13, 1981 | EF3 | 28 km | 3.8 mi | 4 |
| May 10, 1973 | EF3 | 64 km | 89.6 mi | 0 |
| May 24, 1971 | EF3 | 76 km | 1.0 mi | 0 |
| Feb 22, 1971 | EF3 | 37 km | 6.8 mi | 0 |
| Sep 3, 1970 | EF3 | 71 km | 2.3 mi | 0 |
| Nov 16, 1965 | EF3 | 94 km | 3.8 mi | 0 |
| Apr 11, 1965 | EF3 | 87 km | 15.0 mi | 4 |
| Jul 28, 1961 | EF3 | 94 km | 0.5 mi | 0 |
| Jul 19, 1950 | EF3 | 98 km | 9.7 mi | 0 |
| Jun 5, 2024 | EF2 | 82 km | 1.3 mi | 0 |
| Mar 14, 2024 | EF2 | 79 km | 10.3 mi | 0 |
| Mar 14, 2024 | EF2 | 39 km | 19.5 mi | 0 |
| Feb 28, 2024 | EF2 | 78 km | 21.1 mi | 0 |
| Feb 28, 2024 | EF2 | 37 km | 14.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.2 in | Coldest |
| February | 29°F (-2°C) | 2.0 in | Driest |
| March | 39°F (4°C) | 2.8 in | |
| April | 49°F (10°C) | 3.4 in | |
| May | 60°F (16°C) | 4.0 in | |
| June | 69°F (21°C) | 4.0 in | |
| July | 75°F (24°C) | 4.1 in | Warmest, Wettest |
| August | 71°F (22°C) | 3.5 in | |
| September | 65°F (18°C) | 3.0 in | |
| October | 53°F (12°C) | 2.5 in | |
| November | 42°F (6°C) | 3.2 in | |
| December | 32°F (-0°C) | 2.8 in |
Delaware has a seasonal temperature swing of 47°F / from 28°F in January to 75°F in July. Total annual precipitation is 37.4 inches, with July being the wettest month (4.1") and February the driest (2.0").