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Weather & Climate in St. Marys, KS
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
St. Marys experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 29°F in January while summers reach 79°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 34.7 inches. The area receives 16.9 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 1,024 feet.
Temperature
29°F Jan (-2°C)
79°F Jul (26°C)
| Annual Average | 54.5°F |
| 1% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 1,024 ft (312 m) |
| Area | 1.2 sq mi (3.1 km²) |
| Population Density | 2,369/sq mi |
| Coordinates | 39.1942°N, 96.0642°W |
| Timezone | America/Chicago |
| County | Pottawatomie County County |
| Nearest Airport | Philip Billard Municipal (TOP) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 30.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 84.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | No Rating |
| Earthquake | Very Low |
| Wildfire | Relatively Moderate |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
73 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.8.
| Sep 16, 2019 | 15 km NW of Elmdale, Kansas | M3.8 | 99 km | 5 km |
| Dec 17, 2009 | 2 km NW of Auburn, Nebraska | M3.6 | 136 km | 5 km |
| May 15, 2025 | 5 km NNW of Herington, Kansas | M3.5 | 95 km | 5 km |
| Oct 10, 2024 | 6 km WSW of Woodbine, Kansas | M3.5 | 95 km | 10 km |
| Mar 12, 2020 | 6 km NNE of Hope, Kansas | M3.5 | 98 km | 5 km |
| Aug 2, 2025 | 6 km ENE of Assaria, Kansas | M3.4 | 139 km | 5 km |
| Mar 24, 2020 | 8 km NNE of Hope, Kansas | M3.3 | 98 km | 5 km |
| Aug 3, 2025 | 7 km ENE of Assaria, Kansas | M3.3 | 138 km | 5 km |
| Aug 4, 2025 | 5 km E of Assaria, Kansas | M3.3 | 140 km | 10 km |
| Apr 6, 2023 | 6 km N of Bennington, Kansas | M3.3 | 131 km | 5 km |
| May 8, 2021 | 2 km E of Hope, Kansas | M3.2 | 102 km | 5 km |
| May 8, 2021 | 4 km ENE of Hope, Kansas | M3.2 | 99 km | 4 km |
| Jul 30, 2019 | 5 km NNE of Kipp, Kansas | M3.2 | 124 km | 5 km |
| Sep 16, 2019 | 11 km E of Marion, Kansas | M3.2 | 117 km | 5 km |
| Jun 4, 2023 | 13 km SE of Lincolnville, Kansas | M3.2 | 109 km | 5 km |
| Jul 4, 2020 | 5 km W of Kipp, Kansas | M3.1 | 133 km | 5 km |
| Jan 10, 2022 | 4 km ESE of Assaria, Kansas | M3.1 | 142 km | 5 km |
| Mar 22, 2020 | 2 km WNW of Hope, Kansas | M3.1 | 105 km | 5 km |
| Jul 30, 2019 | 2 km ENE of New Cambria, Kansas | M3.1 | 127 km | 5 km |
| May 7, 2021 | 4 km NE of Hope, Kansas | M3.1 | 99 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
625 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 97 fatalities, 1,289 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Jun 8, 1966 | EF5 | 33 km | 21.1 mi | 16 |
| May 20, 1957 | EF5 | 96 km | 69.4 mi | 44 |
| May 28, 2019 | EF4 | 72 km | 29.1 mi | 0 |
| Jun 11, 2008 | EF4 | 56 km | 8.6 mi | 0 |
| Jun 8, 1974 | EF4 | 87 km | 37.5 mi | 6 |
| Jun 8, 1966 | EF4 | 76 km | 19.9 mi | 1 |
| Aug 6, 1962 | EF4 | 44 km | 11.0 mi | 0 |
| May 7, 1961 | EF4 | 98 km | 26.2 mi | 0 |
| May 19, 1960 | EF4 | 10 km | 27.5 mi | 1 |
| May 19, 1960 | EF4 | 23 km | 20.6 mi | 0 |
| May 22, 1952 | EF4 | 77 km | 26.9 mi | 0 |
| Apr 30, 2024 | EF3 | 39 km | 2.2 mi | 1 |
| May 21, 2019 | EF3 | 82 km | 5.9 mi | 0 |
| Jun 3, 2014 | EF3 | 86 km | 6.3 mi | 0 |
| May 28, 2013 | EF3 | 53 km | 4.4 mi | 0 |
| May 21, 2011 | EF3 | 77 km | 10.1 mi | 1 |
| Jun 11, 2008 | EF3 | 96 km | 15.3 mi | 1 |
| May 8, 2003 | EF3 | 74 km | 25.0 mi | 0 |
| Aug 17, 1985 | EF3 | 53 km | 2.0 mi | 0 |
| Apr 26, 1984 | EF3 | 59 km | 32.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: ANNUAL BUR (60,039 acres, 1998).
| Year | Name | Acres Burned | Distance |
| 1998 | ANNUAL BUR | 60,039 | 92 km |
| 2000 | WEST SIDE MVD | 18,701 | 92 km |
| 2016 | BURLEY HILL | 16,381 | 54 km |
| 2023 | WAGSTAFF | 16,111 | 44 km |
| 1988 | UNNAMED | 15,512 | 47 km |
| 2010 | RANGE 51 | 13,760 | 58 km |
| 2001 | TALLGRASS 01 | 10,737 | 95 km |
| 2009 | MA-KILO | 8,935 | 67 km |
| 2024 | AXELTON-BURKLUND | 8,831 | 63 km |
| 2019 | 2019-3238A | 8,632 | 60 km |
| 2018 | ROCK WALL | 8,468 | 94 km |
| 2023 | SMITH HILLS | 8,445 | 35 km |
| 2018 | 190 AND YY RD | 7,919 | 98 km |
| 2002 | UNNAMED | 7,758 | 70 km |
| 2004 | TALLGRASS 04 | 7,733 | 93 km |
| 2005 | TALLGRASS 2005 | 7,510 | 94 km |
| 2013 | UNNAMED | 7,465 | 59 km |
| 2015 | IMPACT | 7,242 | 60 km |
| 2019 | 19 EAST TRAPS TWO SECTION NORTH | 6,804 | 94 km |
| 2014 | MOYER RANCH | 6,641 | 55 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 29°F (-2°C) | 0.8 in | Coldest, Driest |
| February | 33°F (0°C) | 0.9 in | |
| March | 44°F (6°C) | 2.4 in | |
| April | 54°F (12°C) | 3.0 in | |
| May | 64°F (18°C) | 4.8 in | |
| June | 74°F (23°C) | 5.5 in | Wettest |
| July | 79°F (26°C) | 3.7 in | Warmest |
| August | 77°F (25°C) | 3.8 in | |
| September | 68°F (20°C) | 4.4 in | |
| October | 57°F (14°C) | 2.8 in | |
| November | 42°F (6°C) | 1.9 in | |
| December | 31°F (-0°C) | 1.2 in |
St. Marys has a seasonal temperature swing of 51°F / from 29°F in January to 79°F in July. Total annual precipitation is 35.1 inches, with June being the wettest month (5.5") and January the driest (0.8").