Weather & Climate in Grain Valley, MO
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Grain Valley enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 31°F in January while summers reach 79°F in July. Annual precipitation totals 38.3 inches. The area receives 13.2 inches of snow annually. The city sits at an elevation of 801 feet.
Temperature
31°F Jan (-1°C)
79°F Jul (26°C)
| Annual Average | 55.7°F |
| 3% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 79°F (26°C) |
Geography
| Elevation | 801 ft (244 m) |
| Area | 6.2 sq mi (16.0 km²) |
| Population Density | 2,592/sq mi |
| Coordinates | 39.0150°N, 94.1986°W |
| Timezone | America/Chicago |
| Nearest Airport | Kansas City International (MCI) 34 miles away |
Precipitation & Snow
Air Quality
Earthquake History
7 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| May 18, 2005 | Missouri | M3.3 | 65 km | 5 km |
| Jul 31, 2005 | Missouri | M3.3 | 132 km | 5 km |
| Mar 23, 2007 | 5 km N of Nortonville, Kansas | M3.1 | 110 km | 5 km |
| Mar 30, 2001 | 1 km SW of Hermitage, Missouri | M3.1 | 142 km | 5 km |
| May 13, 1999 | 6 km WSW of Kansas City, Kansas | M3.0 | 44 km | 5 km |
| Apr 4, 2015 | 3 km ESE of Clinton, Missouri | M2.6 | 83 km | 2 km |
| Jul 15, 2025 | 3 km W of Hale, Missouri | M2.5 | 95 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
504 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 20 fatalities, 439 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 29, 2004 | EF4 | 96 km | 22.0 mi | 3 |
| May 4, 2003 | EF4 | 55 km | 21.0 mi | 2 |
| May 4, 2003 | EF4 | 34 km | 5.0 mi | 0 |
| May 4, 1977 | EF4 | 38 km | 48.6 mi | 0 |
| May 4, 1977 | EF4 | 24 km | 12.0 mi | 0 |
| Apr 23, 1975 | EF4 | 79 km | 11.4 mi | 1 |
| Apr 19, 1973 | EF4 | 79 km | 10.0 mi | 0 |
| Jun 8, 1966 | EF4 | 86 km | 19.9 mi | 1 |
| May 7, 1961 | EF4 | 65 km | 26.2 mi | 0 |
| May 22, 1952 | EF4 | 88 km | 26.9 mi | 0 |
| Mar 6, 2017 | EF3 | 7 km | 17.7 mi | 0 |
| May 2, 2008 | EF3 | 40 km | 0.9 mi | 0 |
| Mar 12, 2006 | EF3 | 86 km | 35.0 mi | 0 |
| May 29, 2004 | EF3 | 78 km | 7.0 mi | 0 |
| Jun 19, 1981 | EF3 | 93 km | 7.7 mi | 1 |
| May 12, 1980 | EF3 | 78 km | 15.8 mi | 0 |
| May 4, 1977 | EF3 | 72 km | 29.8 mi | 2 |
| May 4, 1977 | EF3 | 24 km | 26.2 mi | 1 |
| May 4, 1977 | EF3 | 81 km | 11.2 mi | 0 |
| Apr 20, 1973 | EF3 | 89 km | 10.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
3 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (2,089 acres, 2006).
| Year | Name | Acres Burned | Distance |
| 2006 | UNNAMED | 2,089 | 81 km |
| 2005 | NR STEELE | 1,652 | 96 km |
| 2012 | HIGHWAY E | 897 | 65 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 1.0 in | Coldest, Driest |
| February | 35°F (2°C) | 1.4 in | |
| March | 45°F (7°C) | 2.1 in | |
| April | 56°F (13°C) | 4.2 in | |
| May | 65°F (19°C) | 5.7 in | Wettest |
| June | 75°F (24°C) | 5.0 in | |
| July | 79°F (26°C) | 4.6 in | Warmest |
| August | 77°F (25°C) | 4.5 in | |
| September | 69°F (21°C) | 3.1 in | |
| October | 57°F (14°C) | 3.4 in | |
| November | 45°F (7°C) | 2.1 in | |
| December | 35°F (2°C) | 1.4 in |
Grain Valley has a seasonal temperature swing of 48°F / from 31°F in January to 79°F in July. Total annual precipitation is 38.3 inches, with May being the wettest month (5.7") and January the driest (1.0").