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Weather & Climate in Palmyra, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Palmyra experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 25°F in January while summers reach 77°F in July. The area gets 265 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 39.2 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 650 feet.
Temperature
25°F Jan (-4°C)
77°F Jul (25°C)
| Annual Average | 52.8°F |
| 2% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 265 days/yr |
Geography
| Elevation | 650 ft (198 m) |
| Area | 2.8 sq mi (7.1 km²) |
| Population Density | 1,168/sq mi |
| Coordinates | 39.7942°N, 91.5233°W |
| Timezone | America/Chicago |
| Nearest Airport | Quincy Regional-Baldwin Field (UIN) 20 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M2.9.
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 46 km | 5 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 118 km | 2 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
388 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 13 fatalities, 215 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 12, 2006 | EF4 | 68 km | 29.0 mi | 0 |
| May 13, 1995 | EF4 | 89 km | 50.0 mi | 0 |
| Apr 23, 1975 | EF4 | 99 km | 28.2 mi | 1 |
| Apr 20, 1973 | EF4 | 83 km | 3.8 mi | 1 |
| Mar 13, 2006 | EF3 | 84 km | 44.5 mi | 0 |
| Mar 12, 2006 | EF3 | 98 km | 19.7 mi | 4 |
| May 10, 2003 | EF3 | 22 km | 12.0 mi | 0 |
| Apr 8, 1999 | EF3 | 62 km | 7.5 mi | 0 |
| Jul 4, 1995 | EF3 | 89 km | 26.0 mi | 0 |
| Jun 21, 1981 | EF3 | 90 km | 8.8 mi | 1 |
| Apr 13, 1974 | EF3 | 53 km | 11.0 mi | 0 |
| Apr 13, 1974 | EF3 | 65 km | 0.1 mi | 0 |
| Sep 30, 1973 | EF3 | 70 km | 0.1 mi | 0 |
| May 1, 1973 | EF3 | 72 km | 3.6 mi | 2 |
| Apr 20, 1973 | EF3 | 84 km | 9.5 mi | 0 |
| Jun 12, 1970 | EF3 | 76 km | 16.0 mi | 0 |
| Jun 12, 1970 | EF3 | 82 km | 8.5 mi | 0 |
| Jan 24, 1967 | EF3 | 99 km | 4.3 mi | 1 |
| Apr 21, 1964 | EF3 | 97 km | 14.1 mi | 0 |
| May 14, 1961 | EF3 | 21 km | 127.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.6 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.6 in | |
| March | 42°F (5°C) | 3.2 in | |
| April | 53°F (12°C) | 3.7 in | |
| May | 63°F (17°C) | 4.5 in | Wettest |
| June | 73°F (23°C) | 3.9 in | |
| July | 77°F (25°C) | 4.4 in | Warmest |
| August | 75°F (24°C) | 3.8 in | |
| September | 67°F (19°C) | 4.1 in | |
| October | 56°F (13°C) | 3.2 in | |
| November | 42°F (6°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.4 in |
Palmyra has a seasonal temperature swing of 52°F / from 25°F in January to 77°F in July. Total annual precipitation is 39.2 inches, with May being the wettest month (4.5") and January the driest (1.6").