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Weather & Climate in Troy, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Troy experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 28°F in January while summers reach 78°F in July. The area gets 269 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 37.1 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 554 feet.
Temperature
28°F Jan (-2°C)
78°F Jul (25°C)
| Annual Average | 54.3°F |
| 1% above US avg | |
| January Average | 28°F (-2°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 269 days/yr |
Geography
| Elevation | 554 ft (169 m) |
| Area | 7.4 sq mi (19.0 km²) |
| Population Density | 1,744/sq mi |
| Coordinates | 38.9795°N, 90.9807°W |
| Timezone | America/Chicago |
| Nearest Airport | St Louis Lambert International (STL) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
21 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 | 101 km | 21 km |
| Aug 27, 1993 | 5 km SSE of Olympian Village, Missouri | M3.3 | 110 km | 22 km |
| Jul 8, 2003 | 1 km N of Leasburg, Missouri | M2.9 | 101 km | 4 km |
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 97 km | 5 km |
| May 18, 2006 | 9 km SSE of De Soto, Missouri | M2.9 | 110 km | 6 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 65 km | 8 km |
| Mar 28, 2024 | 1 km NNE of Germantown, Illinois | M2.8 | 134 km | 24 km |
| Jul 31, 1995 | 8 km SSW of Caledonia, Missouri | M2.8 | 144 km | 5 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 73 km | 19 km |
| Sep 13, 1997 | 3 km SSE of Darmstadt, Illinois | M2.8 | 134 km | 16 km |
| Jul 15, 1990 | 7 km SW of Potosi, Missouri | M2.7 | 123 km | 3 km |
| Nov 12, 1996 | 15 km SSE of Olympian Village, Missouri | M2.7 | 120 km | 5 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 75 km | 8 km |
| Feb 3, 2014 | 18 km NW of Potosi, Missouri | M2.6 | 102 km | 14 km |
| Nov 25, 2013 | 8 km NE of Bonne Terre, Missouri | M2.6 | 120 km | 12 km |
| Mar 7, 2009 | 7 km S of Miramiguoa Park, Missouri | M2.6 | 90 km | 7 km |
| Jun 6, 2017 | 8 km ENE of Bonne Terre, Missouri | M2.6 | 123 km | 25 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 21 km | 2 km |
| Sep 11, 2019 | 6 km NNE of Bonne Terre, Missouri | M2.6 | 118 km | 7 km |
| Jan 15, 1998 | 1 km SSE of Fenton, Missouri | M2.5 | 72 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
490 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 46 fatalities, 910 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 22, 2011 | EF4 | 51 km | 21.3 mi | 0 |
| Apr 3, 1981 | EF4 | 79 km | 11.9 mi | 0 |
| Jan 24, 1967 | EF4 | 50 km | 25.0 mi | 3 |
| Feb 10, 1959 | EF4 | 60 km | 23.9 mi | 21 |
| Feb 24, 1956 | EF4 | 59 km | 77.6 mi | 6 |
| Dec 10, 2021 | EF3 | 84 km | 4.2 mi | 6 |
| Dec 10, 2021 | EF3 | 43 km | 24.8 mi | 1 |
| May 31, 2013 | EF3 | 75 km | 10.6 mi | 0 |
| May 31, 2013 | EF3 | 38 km | 31.7 mi | 0 |
| Dec 31, 2010 | EF3 | 70 km | 6.7 mi | 1 |
| Mar 13, 2006 | EF3 | 35 km | 44.5 mi | 0 |
| Mar 13, 2006 | EF3 | 33 km | 6.0 mi | 0 |
| Nov 15, 1988 | EF3 | 31 km | 1.0 mi | 0 |
| Nov 15, 1988 | EF3 | 94 km | 9.0 mi | 0 |
| Apr 29, 1984 | EF3 | 6 km | 8.0 mi | 0 |
| May 1, 1983 | EF3 | 82 km | 16.0 mi | 0 |
| May 1, 1983 | EF3 | 71 km | 4.0 mi | 0 |
| Apr 22, 1981 | EF3 | 98 km | 7.1 mi | 1 |
| Apr 7, 1980 | EF3 | 61 km | 7.3 mi | 0 |
| Jun 12, 1970 | EF3 | 76 km | 16.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 1.7 in | Coldest, Driest |
| February | 33°F (1°C) | 1.9 in | |
| March | 44°F (7°C) | 3.2 in | |
| April | 55°F (13°C) | 3.7 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 3.6 in | |
| July | 78°F (25°C) | 3.7 in | Warmest |
| August | 76°F (24°C) | 3.1 in | |
| September | 68°F (20°C) | 3.2 in | |
| October | 56°F (14°C) | 2.8 in | |
| November | 44°F (7°C) | 3.2 in | |
| December | 33°F (0°C) | 2.5 in |
Troy has a seasonal temperature swing of 50°F / from 28°F in January to 78°F in July. Total annual precipitation is 37.0 inches, with May being the wettest month (4.3") and January the driest (1.7").