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Weather & Climate in Vandalia, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Vandalia experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 26°F in January while summers reach 77°F in July. The area gets 267 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 38.0 inches. The area receives 5.9 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 764 feet.
Temperature
26°F Jan (-3°C)
77°F Jul (25°C)
| Annual Average | 53.3°F |
| 1% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 267 days/yr |
Geography
| Elevation | 764 ft (233 m) |
| Area | 2.3 sq mi (5.8 km²) |
| Population Density | 1,449/sq mi |
| Coordinates | 39.3109°N, 91.4885°W |
| Timezone | America/Chicago |
| Nearest Airport | Quincy Regional-Baldwin Field (UIN) 46 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
11 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.9.
| Jun 7, 2011 | 18 km NNW of Potosi, Missouri | M3.9 | 146 km | 21 km |
| Jul 31, 2005 | Missouri | M3.3 | 126 km | 5 km |
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 40 km | 5 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 135 km | 4 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 122 km | 8 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 130 km | 19 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 131 km | 8 km |
| Mar 7, 2009 | 7 km S of Miramiguoa Park, Missouri | M2.6 | 131 km | 7 km |
| Feb 3, 2014 | 18 km NW of Potosi, Missouri | M2.6 | 147 km | 14 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 78 km | 2 km |
| Jan 15, 1998 | 1 km SSE of Fenton, Missouri | M2.5 | 129 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
402 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 11 fatalities, 253 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 12, 2006 | EF4 | 61 km | 29.0 mi | 0 |
| Dec 10, 2021 | EF3 | 94 km | 24.8 mi | 1 |
| May 31, 2013 | EF3 | 94 km | 31.7 mi | 0 |
| Mar 13, 2006 | EF3 | 31 km | 44.5 mi | 0 |
| Mar 13, 2006 | EF3 | 53 km | 6.0 mi | 0 |
| Mar 12, 2006 | EF3 | 85 km | 19.7 mi | 4 |
| May 10, 2003 | EF3 | 45 km | 12.0 mi | 0 |
| Nov 10, 1998 | EF3 | 83 km | 2.0 mi | 0 |
| Jul 4, 1995 | EF3 | 82 km | 26.0 mi | 0 |
| Nov 27, 1990 | EF3 | 83 km | 12.0 mi | 0 |
| Nov 27, 1990 | EF3 | 96 km | 1.0 mi | 0 |
| Nov 15, 1988 | EF3 | 89 km | 1.0 mi | 0 |
| Apr 29, 1984 | EF3 | 63 km | 8.0 mi | 0 |
| Apr 13, 1974 | EF3 | 94 km | 0.1 mi | 0 |
| Jun 12, 1970 | EF3 | 97 km | 8.5 mi | 0 |
| Jun 12, 1970 | EF3 | 34 km | 16.0 mi | 0 |
| May 14, 1961 | EF3 | 48 km | 127.1 mi | 0 |
| Apr 24, 1961 | EF3 | 52 km | 64.2 mi | 0 |
| Mar 25, 1954 | EF3 | 82 km | 21.6 mi | 0 |
| Jun 28, 2015 | EF2 | 90 km | 2.3 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: WOOLDRIDGE FIRE (1,323 acres, 2022).
| Year | Name | Acres Burned | Distance |
| 2022 | WOOLDRIDGE FIRE | 1,323 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 1.6 in | Coldest, Driest |
| February | 32°F (-0°C) | 1.8 in | |
| March | 43°F (6°C) | 3.1 in | |
| April | 54°F (12°C) | 3.8 in | |
| May | 64°F (18°C) | 4.5 in | Wettest |
| June | 73°F (23°C) | 3.9 in | |
| July | 77°F (25°C) | 3.6 in | Warmest |
| August | 75°F (24°C) | 3.5 in | |
| September | 67°F (20°C) | 3.5 in | |
| October | 56°F (13°C) | 2.9 in | |
| November | 43°F (6°C) | 3.3 in | |
| December | 32°F (-0°C) | 2.5 in |
Vandalia has a seasonal temperature swing of 51°F / from 26°F in January to 77°F in July. Total annual precipitation is 38.0 inches, with May being the wettest month (4.5") and January the driest (1.6").