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Weather & Climate in Riley, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Riley experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 29°F in January while summers reach 76°F in July. The area gets 293 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 41.8 inches. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 567 feet.
Temperature
29°F Jan (-2°C)
76°F Jul (24°C)
| Annual Average | 53.8°F |
| 0% below US avg | |
| January Average | 29°F (-2°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 567 ft (173 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 5,322/sq mi |
| Coordinates | 39.3898°N, 87.3002°W |
| Timezone | America/Indiana/Indianapolis |
| County | Vigo County County |
| Nearest Airport | Terre Haute Regional (HUF) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 83.2 / 100 |
| Social Vulnerability | 52.4 / 100 |
| Community Resilience | 90.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
41 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.
| Apr 18, 2008 | 7 km NNE of Bellmont, Illinois | M5.2 | 116 km | 14 km |
| Apr 18, 2008 | 9 km NNE of Bellmont, Illinois | M4.7 | 115 km | 15 km |
| Apr 21, 2008 | 7 km NNE of Bellmont, Illinois | M4.0 | 116 km | 18 km |
| Jun 17, 2021 | Illinois-Indiana border region | M3.8 | 49 km | 6 km |
| Sep 12, 2004 | 4 km NW of Manilla, Indiana | M3.8 | 143 km | 2 km |
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 65 km | 0 km |
| Sep 19, 2017 | 4 km N of Bellmont, Illinois | M3.8 | 120 km | 12 km |
| Apr 25, 2008 | 8 km NNE of Bellmont, Illinois | M3.7 | 116 km | 13 km |
| Dec 20, 1990 | 5 km S of Stilesville, Indiana | M3.7 | 62 km | 5 km |
| Nov 20, 2012 | 7 km N of Bellmont, Illinois | M3.6 | 116 km | 19 km |
| Apr 14, 2000 | 4 km NW of Heritage Lake, Indiana | M3.6 | 63 km | 5 km |
| Jun 5, 2008 | 8 km WNW of Mount Carmel, Illinois | M3.4 | 114 km | 16 km |
| May 30, 2015 | 4 km ENE of Geff, Illinois | M3.4 | 138 km | 26 km |
| May 1, 2008 | 8 km NNE of Bellmont, Illinois | M3.3 | 115 km | 14 km |
| May 13, 2025 | 7 km SSW of Lerna, Illinois | M3.3 | 88 km | 10 km |
| Dec 17, 1990 | Illinois-Indiana border region | M3.2 | 79 km | 10 km |
| Jul 18, 2008 | 6 km NNE of Bellmont, Illinois | M3.1 | 117 km | 18 km |
| May 10, 2012 | 0 km NW of Emison, Indiana | M3.1 | 66 km | 11 km |
| Dec 16, 1996 | 3 km NNE of Terre Haute, Indiana | M3.1 | 15 km | 5 km |
| Sep 9, 2017 | 4 km N of Bellmont, Illinois | M3.1 | 120 km | 12 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
485 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 44 fatalities, 658 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1990 | EF4 | 95 km | 11.0 mi | 1 |
| Jun 2, 1990 | EF4 | 97 km | 12.5 mi | 0 |
| Apr 11, 1965 | EF4 | 79 km | 45.7 mi | 28 |
| Mar 31, 2023 | EF3 | 85 km | 40.9 mi | 6 |
| Mar 31, 2023 | EF3 | 50 km | 5.9 mi | 2 |
| May 25, 2011 | EF3 | 100 km | 6.8 mi | 0 |
| Mar 8, 2009 | EF3 | 85 km | 1.1 mi | 0 |
| Nov 15, 2005 | EF3 | 80 km | 12.0 mi | 0 |
| Sep 20, 2002 | EF3 | 61 km | 112.0 mi | 0 |
| Apr 19, 1996 | EF3 | 98 km | 2.0 mi | 1 |
| Nov 22, 1992 | EF3 | 50 km | 12.0 mi | 0 |
| Nov 22, 1992 | EF3 | 67 km | 15.0 mi | 0 |
| Nov 22, 1992 | EF3 | 58 km | 5.3 mi | 0 |
| Jun 2, 1990 | EF3 | 85 km | 7.0 mi | 0 |
| Mar 10, 1986 | EF3 | 67 km | 35.0 mi | 0 |
| Jun 2, 1980 | EF3 | 79 km | 18.1 mi | 1 |
| Jun 25, 1978 | EF3 | 97 km | 1.0 mi | 0 |
| Aug 10, 1974 | EF3 | 94 km | 0.1 mi | 0 |
| Aug 10, 1974 | EF3 | 78 km | 0.1 mi | 0 |
| Apr 3, 1974 | EF3 | 91 km | 14.9 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
2 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,547 acres, 2021).
| Year | Name | Acres Burned | Distance |
| 2021 | UNNAMED | 1,547 | 94 km |
| 2016 | UNNAMED | 898 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 2.2 in | Coldest, Driest |
| February | 31°F (-0°C) | 2.3 in | |
| March | 42°F (5°C) | 3.7 in | |
| April | 53°F (11°C) | 3.9 in | |
| May | 63°F (17°C) | 4.6 in | |
| June | 72°F (22°C) | 3.9 in | |
| July | 76°F (24°C) | 4.8 in | Warmest, Wettest |
| August | 74°F (23°C) | 3.9 in | |
| September | 67°F (19°C) | 3.3 in | |
| October | 55°F (13°C) | 2.6 in | |
| November | 43°F (6°C) | 3.6 in | |
| December | 32°F (0°C) | 3.0 in |
Riley has a seasonal temperature swing of 47°F / from 29°F in January to 76°F in July. Total annual precipitation is 41.8 inches, with July being the wettest month (4.8") and January the driest (2.2").