Weather & Climate in Mercer, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Mercer experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 24°F in January while summers reach 76°F in July. Annual precipitation totals 38.0 inches. The area receives 28.5 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 968 feet.
Temperature
24°F Jan (-4°C)
76°F Jul (24°C)
| Annual Average | 51.1°F |
| 5% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 76°F (24°C) |
Geography
| Elevation | 968 ft (295 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 970/sq mi |
| Coordinates | 40.4095°N, 93.5789°W |
| Timezone | America/Chicago |
| Nearest Airport | Kirksville Regional (IRK) 59 miles away |
Precipitation & Snow
Air Quality
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.1.
| Feb 11, 1995 | 6 km E of Clearmont, Missouri | M3.1 | 117 km | 5 km |
| Jul 15, 2025 | 3 km W of Hale, Missouri | M2.5 | 92 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
387 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 14 fatalities, 192 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 29, 2004 | EF4 | 82 km | 22.0 mi | 3 |
| Apr 8, 1999 | EF4 | 93 km | 56.0 mi | 0 |
| Jun 7, 1984 | EF4 | 38 km | 134.0 mi | 3 |
| Jun 2, 1980 | EF4 | 37 km | 31.2 mi | 0 |
| Apr 23, 1975 | EF4 | 86 km | 11.4 mi | 1 |
| Apr 21, 1973 | EF4 | 9 km | 14.6 mi | 0 |
| Apr 21, 1967 | EF4 | 86 km | 59.0 mi | 0 |
| Jan 24, 1967 | EF4 | 89 km | 25.7 mi | 0 |
| May 20, 1959 | EF4 | 49 km | 17.2 mi | 0 |
| May 10, 1953 | EF4 | 55 km | 6.4 mi | 0 |
| Mar 5, 2022 | EF3 | 61 km | 11.3 mi | 1 |
| Aug 20, 2019 | EF3 | 95 km | 5.4 mi | 0 |
| Jun 22, 2015 | EF3 | 93 km | 11.1 mi | 0 |
| Apr 11, 2001 | EF3 | 67 km | 76.5 mi | 0 |
| Apr 8, 1999 | EF3 | 74 km | 39.0 mi | 0 |
| May 27, 1995 | EF3 | 40 km | 30.4 mi | 0 |
| Mar 29, 1979 | EF3 | 79 km | 57.0 mi | 0 |
| Apr 23, 1975 | EF3 | 78 km | 14.0 mi | 0 |
| May 5, 1971 | EF3 | 92 km | 0.1 mi | 0 |
| May 5, 1971 | EF3 | 97 km | 2.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
1 wildfire (100+ acres) recorded within 100 km. Largest: HIGHWAY E (897 acres, 2012).
| Year | Name | Acres Burned | Distance |
| 2012 | HIGHWAY E | 897 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 1.1 in | Coldest, Driest |
| February | 29°F (-2°C) | 1.2 in | |
| March | 40°F (5°C) | 2.2 in | |
| April | 51°F (11°C) | 4.2 in | |
| May | 61°F (16°C) | 5.1 in | |
| June | 71°F (22°C) | 5.6 in | Wettest |
| July | 76°F (24°C) | 3.9 in | Warmest |
| August | 74°F (23°C) | 4.3 in | |
| September | 65°F (19°C) | 3.8 in | |
| October | 54°F (12°C) | 3.3 in | |
| November | 40°F (5°C) | 1.9 in | |
| December | 29°F (-2°C) | 1.4 in |
Mercer has a seasonal temperature swing of 51°F / from 24°F in January to 76°F in July. Total annual precipitation is 38.0 inches, with June being the wettest month (5.6") and January the driest (1.1").