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Weather & Climate in Mount Vernon, IN
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mount Vernon enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 32°F in January while summers reach 77°F in July. The area gets 305 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 46.6 inches (wetter than the 38-inch national average). The area receives 8.4 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 420 feet.
Temperature
32°F Jan (0°C)
77°F Jul (25°C)
| Annual Average | 56.0°F |
| 4% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 305 days/yr |
Geography
| Elevation | 420 ft (128 m) |
| Area | 2.9 sq mi (7.4 km²) |
| Population Density | 2,233/sq mi |
| Coordinates | 37.9370°N, 87.8959°W |
| Timezone | America/Indiana/Indianapolis |
| County | Union County County |
| Nearest Airport | Evansville Regional (EVV) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 42.8 / 100 |
| Social Vulnerability | 69.3 / 100 |
| Community Resilience | 34.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
84 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 | 57 km | 14 km |
| Apr 18, 2008 | 9 km NNE of Bellmont, Illinois | M4.7 | 58 km | 15 km |
| Jun 18, 2002 | 6 km SW of Parkers Settlement, Indiana | M4.6 | 14 km | 16 km |
| Feb 5, 1994 | 2 km WNW of Dongola, Illinois | M4.2 | 130 km | 16 km |
| Apr 21, 2008 | 7 km NNE of Bellmont, Illinois | M4.0 | 57 km | 18 km |
| Jan 24, 1990 | 6 km WNW of Alton, Indiana | M3.9 | 125 km | 10 km |
| Dec 7, 2000 | 7 km W of Evansville, Indiana | M3.9 | 23 km | 5 km |
| Nov 11, 1991 | 3 km W of Flat Rock, Illinois | M3.8 | 109 km | 0 km |
| Sep 19, 2017 | 4 km N of Bellmont, Illinois | M3.8 | 54 km | 12 km |
| Jan 27, 1990 | 6 km N of Alton, Indiana | M3.8 | 131 km | 5 km |
| Apr 25, 2008 | 8 km NNE of Bellmont, Illinois | M3.7 | 57 km | 13 km |
| Jun 20, 2005 | 4 km WSW of Blandville, Kentucky | M3.6 | 149 km | 19 km |
| Nov 20, 2012 | 7 km N of Bellmont, Illinois | M3.6 | 58 km | 19 km |
| Jan 2, 2006 | 3 km NNE of Eldorado, Illinois | M3.6 | 47 km | 7 km |
| May 1, 2016 | 5 km SE of New Grand Chain, Illinois | M3.5 | 125 km | 16 km |
| May 30, 2015 | 4 km ENE of Geff, Illinois | M3.4 | 71 km | 26 km |
| Sep 26, 1994 | 4 km ENE of Blandville, Kentucky | M3.4 | 141 km | 13 km |
| Jun 5, 2008 | 8 km WNW of Mount Carmel, Illinois | M3.4 | 58 km | 16 km |
| May 1, 2008 | 8 km NNE of Bellmont, Illinois | M3.3 | 57 km | 14 km |
| Apr 8, 1998 | 2 km NNW of Blandville, Kentucky | M3.2 | 144 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
507 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 51 fatalities, 850 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Feb 29, 2012 | EF4 | 72 km | 26.1 mi | 8 |
| Nov 15, 2005 | EF4 | 83 km | 15.0 mi | 0 |
| Jun 2, 1990 | EF4 | 61 km | 106.0 mi | 1 |
| Jun 2, 1990 | EF4 | 70 km | 13.0 mi | 6 |
| Jun 2, 1990 | EF4 | 86 km | 23.0 mi | 0 |
| Jan 7, 1989 | EF4 | 61 km | 19.0 mi | 0 |
| Jul 9, 2024 | EF3 | 3 km | 5.8 mi | 0 |
| May 26, 2024 | EF3 | 93 km | 34.1 mi | 1 |
| Feb 28, 2017 | EF3 | 29 km | 44.1 mi | 1 |
| Nov 17, 2013 | EF3 | 94 km | 8.2 mi | 0 |
| Nov 17, 2013 | EF3 | 27 km | 14.1 mi | 0 |
| Apr 10, 2009 | EF3 | 98 km | 2.0 mi | 0 |
| Mar 28, 2009 | EF3 | 34 km | 12.4 mi | 0 |
| Oct 18, 2007 | EF3 | 66 km | 7.0 mi | 0 |
| Nov 6, 2005 | EF3 | 16 km | 41.3 mi | 24 |
| Nov 6, 2005 | EF3 | 59 km | 11.2 mi | 0 |
| May 11, 2003 | EF3 | 80 km | 1.8 mi | 0 |
| Apr 28, 2002 | EF3 | 98 km | 22.0 mi | 0 |
| Apr 28, 2002 | EF3 | 62 km | 22.0 mi | 0 |
| Apr 21, 2002 | EF3 | 86 km | 31.5 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (2,286 acres, 2019).
| Year | Name | Acres Burned | Distance |
| 2019 | UNNAMED | 2,286 | 81 km |
| 2021 | GAP VIEW RX | 1,575 | 67 km |
| 2022 | DENNISON HOLLOW RX | 1,573 | 56 km |
| 2021 | UNNAMED | 1,510 | 80 km |
| 2022 | ONE HORSE GAP RX | 1,502 | 68 km |
| 2014 | UNNAMED | 1,493 | 54 km |
| 2015 | UNNAMED | 1,447 | 57 km |
| 2021 | BEATTY BRANCH RX | 1,396 | 80 km |
| 2016 | UNNAMED | 1,299 | 68 km |
| 2014 | UNNAMED | 1,216 | 68 km |
| 2013 | UNNAMED | 1,203 | 68 km |
| 2024 | PINE HOLLOW RX | 1,038 | 88 km |
| 2021 | ROCKY BRANCH RX | 1,033 | 83 km |
| 2015 | UNNAMED | 1,008 | 68 km |
| 2024 | CAVE HILL RX | 999 | 53 km |
| 2017 | UNNAMED | 994 | 57 km |
| 2024 | PLEASANT VALLEY RX | 899 | 82 km |
| 2021 | ONE HORSE GAP RX | 865 | 68 km |
| 2024 | DEAN EAST RX | 753 | 98 km |
| 2024 | COPPEROUS BRANCH RX | 744 | 79 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 3.0 in | Coldest |
| February | 36°F (2°C) | 3.2 in | |
| March | 46°F (8°C) | 4.7 in | |
| April | 56°F (13°C) | 4.4 in | |
| May | 66°F (19°C) | 5.1 in | Wettest |
| June | 74°F (24°C) | 4.0 in | |
| July | 77°F (25°C) | 4.1 in | Warmest |
| August | 76°F (25°C) | 3.2 in | |
| September | 70°F (21°C) | 2.8 in | Driest |
| October | 58°F (15°C) | 2.9 in | |
| November | 47°F (8°C) | 4.2 in | |
| December | 37°F (3°C) | 3.7 in |
Mount Vernon has a seasonal temperature swing of 45°F / from 32°F in January to 77°F in July. Total annual precipitation is 45.2 inches, with May being the wettest month (5.1") and September the driest (2.8").