All Countries
Weather & Climate in Keystone, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Keystone experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 25°F in January while summers reach 73°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 40.0 inches. The area receives 23.3 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 861 feet.
Temperature
25°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 50.1°F |
| 7% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 861 ft (262 m) |
| Area | 0.9 sq mi (2.3 km²) |
| Population Density | 105/sq mi |
| Coordinates | 40.5922°N, 85.2625°W |
| Timezone | America/Indiana/Indianapolis |
| County | Blackford County County |
| Nearest Airport | Delaware County Regional (MIE) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 9.0 / 100 |
| Social Vulnerability | 51.5 / 100 |
| Community Resilience | 90.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
8 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Sep 12, 2004 | 4 km NW of Manilla, Indiana | M3.8 | 115 km | 2 km |
| Jan 26, 2012 | 5 km NE of Topeka, Indiana | M3.0 | 111 km | 5 km |
| Apr 17, 1990 | 8 km NW of Fort Recovery, Ohio | M3.0 | 38 km | 5 km |
| Apr 4, 1994 | 2 km WNW of Minster, Ohio | M2.9 | 76 km | 5 km |
| May 12, 2006 | 2 km E of Lima, Ohio | M2.8 | 101 km | 5 km |
| Jun 12, 2015 | 6 km NW of Convoy, Ohio | M2.6 | 58 km | 5 km |
| Jan 30, 2004 | 2 km S of Rockford, Ohio | M2.5 | 52 km | 5 km |
| Jun 4, 1990 | 4 km SSE of Van Buren, Ohio | M2.5 | 148 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
555 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 65 fatalities, 1,609 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 10, 2002 | EF4 | 47 km | 52.8 mi | 4 |
| Feb 18, 1992 | EF4 | 60 km | 2.8 mi | 0 |
| Apr 3, 1974 | EF4 | 60 km | 18.0 mi | 1 |
| Apr 3, 1974 | EF4 | 99 km | 18.9 mi | 0 |
| Apr 11, 1965 | EF4 | 11 km | 52.5 mi | 4 |
| Apr 11, 1965 | EF4 | 79 km | 18.4 mi | 3 |
| Apr 11, 1965 | EF4 | 97 km | 48.0 mi | 25 |
| Apr 11, 1965 | EF4 | 93 km | 32.5 mi | 13 |
| Mar 6, 1956 | EF4 | 26 km | 1.9 mi | 1 |
| Mar 14, 2024 | EF3 | 93 km | 31.3 mi | 3 |
| Mar 14, 2024 | EF3 | 47 km | 41.3 mi | 1 |
| Mar 31, 2023 | EF3 | 31 km | 6.4 mi | 0 |
| May 27, 2019 | EF3 | 96 km | 10.5 mi | 0 |
| May 27, 2019 | EF3 | 49 km | 10.8 mi | 1 |
| May 27, 2019 | EF3 | 11 km | 12.8 mi | 0 |
| May 27, 2019 | EF3 | 85 km | 13.7 mi | 0 |
| Aug 24, 2016 | EF3 | 68 km | 5.2 mi | 0 |
| Aug 24, 2016 | EF3 | 80 km | 8.6 mi | 0 |
| Jun 5, 2010 | EF3 | 78 km | 7.5 mi | 0 |
| May 30, 2004 | EF3 | 75 km | 4.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 2.0 in | Coldest |
| February | 27°F (-3°C) | 1.9 in | Driest |
| March | 38°F (3°C) | 3.0 in | |
| April | 49°F (9°C) | 3.7 in | |
| May | 60°F (16°C) | 3.9 in | |
| June | 69°F (21°C) | 4.0 in | Wettest |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 71°F (22°C) | 3.5 in | |
| September | 64°F (18°C) | 3.0 in | |
| October | 53°F (12°C) | 2.6 in | |
| November | 41°F (5°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.8 in |
Keystone has a seasonal temperature swing of 49°F / from 25°F in January to 73°F in July. Total annual precipitation is 37.3 inches, with June being the wettest month (4.0") and February the driest (1.9").