All Countries
Weather & Climate in St. Clair, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Clair experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 79°F in July. The area gets 261 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 41.3 inches. The area receives 5.6 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 (-2°C)
79°F Jul (26°C)
| Annual Average | 55.4°F |
| 3% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 261 days/yr |
Geography
| Elevation | 755 ft (230 m) |
| Area | 1.4 sq mi (3.7 km²) |
| Population Density | 989/sq mi |
| Coordinates | 38.0593°N, 93.7945°W |
| Timezone | America/Chicago |
| Nearest Airport | Sedalia Regional (DMO) 56 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
8 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| May 18, 2005 | Missouri | M3.3 | 47 km | 5 km |
| Jul 31, 2005 | Missouri | M3.3 | 119 km | 5 km |
| Mar 30, 2001 | 1 km SW of Hermitage, Missouri | M3.1 | 43 km | 5 km |
| Jan 21, 1992 | 5 km SE of Linn Creek, Missouri | M3.1 | 99 km | 5 km |
| May 13, 1999 | 6 km WSW of Kansas City, Kansas | M3.0 | 140 km | 5 km |
| Apr 4, 2015 | 3 km ESE of Clinton, Missouri | M2.6 | 34 km | 2 km |
| Apr 23, 2025 | 3 km E of Hartville, Missouri | M2.6 | 147 km | 4 km |
| Apr 29, 2018 | 3 km WNW of Evergreen, Missouri | M2.5 | 117 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
430 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 23 fatalities, 338 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 19, 1973 | EF4 | 57 km | 10.0 mi | 0 |
| May 22, 2019 | EF3 | 92 km | 11.3 mi | 3 |
| Mar 12, 2006 | EF3 | 40 km | 17.0 mi | 0 |
| May 4, 2003 | EF3 | 84 km | 86.0 mi | 5 |
| May 4, 2003 | EF3 | 86 km | 14.0 mi | 4 |
| May 4, 1999 | EF3 | 15 km | 3.0 mi | 0 |
| May 17, 1995 | EF3 | 65 km | 14.0 mi | 0 |
| Mar 15, 1982 | EF3 | 19 km | 14.0 mi | 0 |
| May 12, 1980 | EF3 | 75 km | 15.8 mi | 0 |
| May 4, 1977 | EF3 | 78 km | 29.8 mi | 2 |
| May 4, 1977 | EF3 | 72 km | 11.2 mi | 0 |
| Apr 20, 1973 | EF3 | 54 km | 1.0 mi | 0 |
| Apr 20, 1973 | EF3 | 52 km | 19.4 mi | 0 |
| Apr 20, 1973 | EF3 | 52 km | 10.1 mi | 0 |
| Apr 20, 1973 | EF3 | 77 km | 7.8 mi | 0 |
| Apr 20, 1973 | EF3 | 53 km | 5.0 mi | 0 |
| May 15, 1968 | EF3 | 98 km | 2.7 mi | 0 |
| Apr 12, 1964 | EF3 | 89 km | 19.5 mi | 1 |
| Apr 15, 1960 | EF3 | 95 km | 8.4 mi | 0 |
| Nov 17, 1958 | EF3 | 83 km | 30.2 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 | 79 km |
| 1994 | UNNAMED | 5,344 | 94 km |
| 2006 | BIG SPRING FIRE | 4,921 | 78 km |
| 2010 | UNNAMED | 4,767 | 80 km |
| 2009 | MOUNTAIN CREEK | 4,322 | 91 km |
| 1991 | UNNAMED | 4,179 | 86 km |
| 1992 | UNNAMED | 3,538 | 78 km |
| 1991 | UNNAMED | 3,533 | 92 km |
| 1991 | UNNAMED | 3,492 | 79 km |
| 1994 | UNNAMED | 3,336 | 91 km |
| 1991 | UNNAMED | 3,135 | 84 km |
| 2012 | KINFOLK RD | 2,883 | 92 km |
| 1991 | UNNAMED | 2,763 | 53 km |
| 2007 | UNNAMED | 2,710 | 78 km |
| 2005 | UNNAMED | 2,590 | 79 km |
| 2006 | UNNAMED | 2,575 | 79 km |
| 1991 | UNNAMED | 2,569 | 97 km |
| 2002 | UNNAMED | 2,418 | 90 km |
| 1991 | UNNAMED | 2,369 | 89 km |
| 2021 | UNNAMED | 2,166 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 1.5 in | Coldest, Driest |
| February | 35°F (2°C) | 1.8 in | |
| March | 45°F (7°C) | 3.2 in | |
| April | 56°F (13°C) | 4.0 in | |
| May | 64°F (18°C) | 4.9 in | Wettest |
| June | 73°F (23°C) | 4.9 in | |
| July | 79°F (26°C) | 3.3 in | Warmest |
| August | 77°F (25°C) | 3.9 in | |
| September | 69°F (21°C) | 4.4 in | |
| October | 58°F (14°C) | 4.0 in | |
| November | 45°F (7°C) | 3.1 in | |
| December | 35°F (1°C) | 2.3 in |
St. Clair has a seasonal temperature swing of 49°F / from 29°F in January to 79°F in July. Total annual precipitation is 41.3 inches, with May being the wettest month (4.9") and January the driest (1.5").