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Weather & Climate in Washington, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Washington experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 28°F in January while summers reach 72°F in July. The area gets 266 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 38.5 inches. The area receives 7.8 inches of snow annually. Air quality is rated Good with a median AQI of 41. The city sits at an elevation of 1,168 feet.
Temperature
28°F Jan (-2°C)
72°F Jul (22°C)
| Annual Average | 50.6°F |
| 6% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 266 days/yr |
Geography
| Elevation | 1,168 ft (356 m) |
| Area | 9.9 sq mi (25.5 km²) |
| Population Density | 1,492/sq mi |
| Coordinates | 40.1740°N, 80.2462°W |
| Timezone | America/Chicago |
| Nearest Airport | Pittsburgh International (PIT) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
15 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.5.
| Sep 25, 1998 | 2 km SW of Adamsville, Pennsylvania | M4.5 | 147 km | 5 km |
| Jun 3, 2017 | 1 km WNW of Batesville, Ohio | M3.4 | 94 km | 2 km |
| Apr 24, 2025 | 3 km S of Pleasant City, Ohio | M3.1 | 116 km | 6 km |
| Apr 22, 2025 | 3 km ESE of Buffalo, Ohio | M3.1 | 110 km | 5 km |
| Aug 31, 2011 | 3 km SE of Lowell, Ohio | M3.1 | 128 km | 5 km |
| Apr 2, 2017 | 5 km W of Graysville, Ohio | M3.0 | 102 km | 4 km |
| Mar 30, 2024 | 2 km SSW of Maple Ridge, Ohio | M3.0 | 106 km | 6 km |
| May 9, 2025 | 3 km S of Pleasant City, Ohio | M2.9 | 116 km | 5 km |
| Aug 7, 2000 | 2 km S of Limaville, Ohio | M2.9 | 116 km | 5 km |
| Apr 29, 2025 | 1 km SE of Pleasant City, Ohio | M2.8 | 114 km | 2 km |
| Feb 3, 2025 | 0 km NE of Reno, Ohio | M2.8 | 132 km | 10 km |
| Aug 31, 2011 | 2 km NNW of Belmont, West Virginia | M2.8 | 123 km | 5 km |
| Sep 4, 2011 | 3 km N of Saint Marys, West Virginia | M2.6 | 117 km | 5 km |
| Jan 26, 2018 | 7 km NNW of Vincent, Ohio | M2.5 | 150 km | 11 km |
| Sep 11, 2024 | 4 km WNW of Claysville, Pennsylvania | M2.5 | 18 km | 4 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
261 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 15 fatalities, 560 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 2, 1998 | EF4 | 88 km | 36.5 mi | 0 |
| Jun 3, 1980 | EF4 | 69 km | 11.8 mi | 0 |
| May 31, 1985 | EF3 | 74 km | 39.0 mi | 9 |
| Jun 3, 1980 | EF3 | 78 km | 29.8 mi | 0 |
| Oct 12, 1978 | EF3 | 90 km | 7.3 mi | 0 |
| Jul 11, 1976 | EF3 | 66 km | 11.8 mi | 1 |
| May 8, 1969 | EF3 | 82 km | 2.0 mi | 1 |
| Aug 3, 1963 | EF3 | 35 km | 0.1 mi | 2 |
| Jun 26, 2024 | EF2 | 55 km | 10.8 mi | 0 |
| May 11, 2024 | EF2 | 19 km | 5.8 mi | 0 |
| May 7, 2024 | EF2 | 65 km | 15.3 mi | 0 |
| Feb 28, 2024 | EF2 | 86 km | 4.1 mi | 0 |
| Aug 25, 2023 | EF2 | 71 km | 2.0 mi | 0 |
| Aug 1, 2022 | EF2 | 30 km | 1.8 mi | 0 |
| Oct 21, 2021 | EF2 | 23 km | 15.7 mi | 0 |
| Jul 29, 2021 | EF2 | 81 km | 6.2 mi | 0 |
| Jul 29, 2021 | EF2 | 65 km | 2.7 mi | 0 |
| Oct 2, 2018 | EF2 | 72 km | 1.6 mi | 0 |
| Mar 23, 2011 | EF2 | 45 km | 9.0 mi | 0 |
| Apr 28, 2002 | EF2 | 97 km | 5.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 2.6 in | Coldest |
| February | 30°F (-1°C) | 2.3 in | Driest |
| March | 39°F (4°C) | 3.3 in | |
| April | 49°F (10°C) | 3.2 in | |
| May | 59°F (15°C) | 4.0 in | |
| June | 68°F (20°C) | 4.0 in | |
| July | 72°F (22°C) | 4.1 in | Warmest, Wettest |
| August | 71°F (21°C) | 3.5 in | |
| September | 64°F (18°C) | 3.2 in | |
| October | 53°F (11°C) | 2.5 in | |
| November | 42°F (6°C) | 3.1 in | |
| December | 33°F (0°C) | 2.9 in |
Washington has a seasonal temperature swing of 44°F / from 28°F in January to 72°F in July. Total annual precipitation is 38.6 inches, with July being the wettest month (4.1") and February the driest (2.3").