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Weather & Climate in Merriam, KS
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Merriam enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 31°F in January while summers reach 81°F in July. The area gets 302 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 38.1 inches. The area receives 11.0 inches of snow annually. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 938 feet.
Temperature
31°F Jan (-1°C)
81°F Jul (27°C)
| Annual Average | 56.9°F |
| 5% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 938 ft (286 m) |
| Area | 4.3 sq mi (11.2 km²) |
| Population Density | 2,555/sq mi |
| Coordinates | 39.0176°N, 94.6940°W |
| Timezone | America/Chicago |
| County | Wyandotte County County |
| Nearest Airport | Kansas City International (MCI) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 89.4 / 100 |
| Social Vulnerability | 58.8 / 100 |
| Community Resilience | 42.2 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | No Rating |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Very High |
| Heat Wave | Relatively High |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.3.
| May 18, 2005 | Missouri | M3.3 | 88 km | 5 km |
| Mar 23, 2007 | 5 km N of Nortonville, Kansas | M3.1 | 75 km | 5 km |
| May 13, 1999 | 6 km WSW of Kansas City, Kansas | M3.0 | 9 km | 5 km |
| Apr 4, 2015 | 3 km ESE of Clinton, Missouri | M2.6 | 110 km | 2 km |
| Jul 15, 2025 | 3 km W of Hale, Missouri | M2.5 | 130 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
583 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 75 fatalities, 612 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 20, 1957 | EF5 | 94 km | 69.4 mi | 44 |
| May 28, 2019 | EF4 | 62 km | 29.1 mi | 0 |
| May 4, 2003 | EF4 | 13 km | 21.0 mi | 2 |
| May 4, 2003 | EF4 | 30 km | 5.0 mi | 0 |
| May 4, 1977 | EF4 | 41 km | 12.0 mi | 0 |
| May 4, 1977 | EF4 | 69 km | 48.6 mi | 0 |
| Apr 23, 1975 | EF4 | 98 km | 11.4 mi | 1 |
| Jun 8, 1966 | EF4 | 45 km | 19.9 mi | 1 |
| May 7, 1961 | EF4 | 27 km | 26.2 mi | 0 |
| May 22, 1952 | EF4 | 46 km | 26.9 mi | 0 |
| Mar 6, 2017 | EF3 | 40 km | 17.7 mi | 0 |
| May 2, 2008 | EF3 | 35 km | 0.9 mi | 0 |
| May 29, 2004 | EF3 | 57 km | 7.0 mi | 0 |
| Apr 26, 1984 | EF3 | 76 km | 32.0 mi | 0 |
| Jun 19, 1981 | EF3 | 50 km | 7.7 mi | 1 |
| May 4, 1977 | EF3 | 67 km | 29.8 mi | 2 |
| May 4, 1977 | EF3 | 67 km | 26.2 mi | 1 |
| May 4, 1977 | EF3 | 63 km | 31.6 mi | 0 |
| Jun 26, 1969 | EF3 | 19 km | 10.1 mi | 0 |
| May 15, 1968 | EF3 | 43 km | 2.7 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
3 wildfires (100+ acres) recorded within 100 km. Largest: NR STEELE (1,652 acres, 2005).
| Year | Name | Acres Burned | Distance |
| 2005 | NR STEELE | 1,652 | 88 km |
| 1994 | UNNAMED | 1,097 | 94 km |
| 2012 | HIGHWAY E | 897 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 1.2 in | Coldest, Driest |
| February | 34°F (1°C) | 1.3 in | |
| March | 44°F (7°C) | 2.6 in | |
| April | 55°F (13°C) | 3.7 in | |
| May | 65°F (18°C) | 5.3 in | Wettest |
| June | 74°F (23°C) | 5.1 in | |
| July | 81°F (27°C) | 4.1 in | Warmest |
| August | 77°F (25°C) | 3.7 in | |
| September | 69°F (20°C) | 4.9 in | |
| October | 57°F (14°C) | 3.5 in | |
| November | 43°F (6°C) | 2.7 in | |
| December | 33°F (0°C) | 1.7 in |
Merriam has a seasonal temperature swing of 50°F / from 31°F in January to 81°F in July. Total annual precipitation is 39.6 inches, with May being the wettest month (5.3") and January the driest (1.2").