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Weather & Climate in St. Thomas, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Thomas experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 78°F in July. The area gets 263 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 6.1 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 755 feet.
Temperature
29°F Jan (-1°C)
78°F Jul (26°C)
| Annual Average | 55.1°F |
| 2% above US avg | |
| January Average | 29°F (-1°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 263 days/yr |
Geography
| Elevation | 755 ft (230 m) |
| Area | 1.0 sq mi (2.5 km²) |
| Population Density | 277/sq mi |
| Coordinates | 38.3742°N, 92.2145°W |
| Timezone | America/Chicago |
| Nearest Airport | Columbia Regional (COU) 31 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
14 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 | 119 km | 21 km |
| Jul 31, 2005 | Missouri | M3.3 | 59 km | 5 km |
| Mar 30, 2001 | 1 km SW of Hermitage, Missouri | M3.1 | 109 km | 5 km |
| Jan 21, 1992 | 5 km SE of Linn Creek, Missouri | M3.1 | 58 km | 5 km |
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 128 km | 5 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 85 km | 4 km |
| Jul 31, 1995 | 8 km SSW of Caledonia, Missouri | M2.8 | 145 km | 5 km |
| Jul 15, 1990 | 7 km SW of Potosi, Missouri | M2.7 | 132 km | 3 km |
| Apr 4, 2015 | 3 km ESE of Clinton, Missouri | M2.6 | 133 km | 2 km |
| Mar 7, 2009 | 7 km S of Miramiguoa Park, Missouri | M2.6 | 102 km | 7 km |
| Feb 3, 2014 | 18 km NW of Potosi, Missouri | M2.6 | 117 km | 14 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 141 km | 2 km |
| Apr 23, 2025 | 3 km E of Hartville, Missouri | M2.6 | 126 km | 4 km |
| Apr 29, 2018 | 3 km WNW of Evergreen, Missouri | M2.5 | 98 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
383 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 11 fatalities, 221 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2019 | EF3 | 35 km | 32.7 mi | 0 |
| Dec 31, 2010 | EF3 | 60 km | 11.0 mi | 2 |
| Dec 31, 2010 | EF3 | 77 km | 7.5 mi | 0 |
| Jan 7, 2008 | EF3 | 54 km | 1.8 mi | 0 |
| Jan 7, 2008 | EF3 | 54 km | 4.7 mi | 0 |
| Mar 13, 2006 | EF3 | 94 km | 6.0 mi | 0 |
| May 4, 2003 | EF3 | 75 km | 14.0 mi | 4 |
| Jun 1, 1999 | EF3 | 63 km | 7.0 mi | 0 |
| Nov 10, 1998 | EF3 | 65 km | 2.0 mi | 0 |
| Nov 27, 1990 | EF3 | 60 km | 1.0 mi | 0 |
| Nov 27, 1990 | EF3 | 65 km | 12.0 mi | 0 |
| May 1, 1983 | EF3 | 27 km | 9.0 mi | 0 |
| Apr 20, 1973 | EF3 | 93 km | 19.4 mi | 0 |
| Jun 12, 1970 | EF3 | 93 km | 16.0 mi | 0 |
| Apr 15, 2023 | EF2 | 42 km | 6.9 mi | 0 |
| May 11, 2016 | EF2 | 93 km | 4.4 mi | 0 |
| Jun 19, 2011 | EF2 | 95 km | 2.8 mi | 0 |
| May 25, 2011 | EF2 | 93 km | 2.1 mi | 0 |
| May 8, 2009 | EF2 | 88 km | 2.0 mi | 0 |
| Mar 31, 2008 | EF2 | 85 km | 1.8 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (7,388 acres, 1994).
| Year | Name | Acres Burned | Distance |
| 1994 | UNNAMED | 7,388 | 81 km |
| 1994 | UNNAMED | 5,344 | 85 km |
| 2006 | BIG SPRING FIRE | 4,921 | 82 km |
| 2010 | UNNAMED | 4,767 | 79 km |
| 2023 | ELM SPRINGS RX | 4,378 | 65 km |
| 2009 | MOUNTAIN CREEK | 4,322 | 82 km |
| 1991 | UNNAMED | 4,179 | 88 km |
| 2023 | CANNON RANGE RX | 3,870 | 83 km |
| 1992 | UNNAMED | 3,538 | 79 km |
| 1991 | UNNAMED | 3,533 | 88 km |
| 1991 | UNNAMED | 3,492 | 89 km |
| 1994 | UNNAMED | 3,336 | 73 km |
| 2021 | KAINTUCK | 3,325 | 65 km |
| 1991 | UNNAMED | 3,135 | 85 km |
| 2012 | KINFOLK RD | 2,883 | 83 km |
| 2005 | UNNAMED | 2,831 | 65 km |
| 1991 | UNNAMED | 2,763 | 91 km |
| 2007 | UNNAMED | 2,710 | 83 km |
| 2005 | UNNAMED | 2,590 | 80 km |
| 2006 | UNNAMED | 2,575 | 79 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-1°C) | 1.6 in | Coldest, Driest |
| February | 35°F (2°C) | 2.0 in | |
| March | 45°F (7°C) | 3.4 in | |
| April | 55°F (13°C) | 3.7 in | |
| May | 64°F (18°C) | 5.0 in | Wettest |
| June | 73°F (23°C) | 4.2 in | |
| July | 78°F (26°C) | 3.4 in | Warmest |
| August | 77°F (25°C) | 3.5 in | |
| September | 68°F (20°C) | 4.0 in | |
| October | 57°F (14°C) | 3.5 in | |
| November | 45°F (7°C) | 3.4 in | |
| December | 34°F (1°C) | 2.6 in |
St. Thomas has a seasonal temperature swing of 49°F / from 29°F in January to 78°F in July. Total annual precipitation is 40.0 inches, with May being the wettest month (5.0") and January the driest (1.6").