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Weather & Climate in Oswego, KS
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Oswego enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 32°F in January while summers reach 79°F in July. The area gets 305 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 44.9 inches. The area receives 7.1 inches of snow annually. Air quality is rated Good with a median AQI of 39. The city sits at an elevation of 908 feet.
Temperature
32°F Jan (0°C)
79°F Jul (26°C)
| Annual Average | 56.5°F |
| 5% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 305 days/yr |
Geography
| Elevation | 908 ft (277 m) |
| Area | 2.3 sq mi (6.0 km²) |
| Population Density | 734/sq mi |
| Coordinates | 37.1676°N, 95.1121°W |
| Timezone | America/Chicago |
| County | Labette County County |
| Nearest Airport | Miami Regional (MIO) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 66.2 / 100 |
| Social Vulnerability | 84.7 / 100 |
| Community Resilience | 65.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very 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: M2.8.
| Mar 23, 2024 | 9 km SE of Foyil, Oklahoma | M2.8 | 94 km | 5 km |
| Jan 14, 2016 | 7 km W of Talala, Oklahoma | M2.7 | 93 km | 5 km |
| Sep 3, 2015 | 6 km WSW of Vera, Oklahoma | M2.6 | 111 km | 5 km |
| May 21, 2010 | 2 km SW of Centerton, Arkansas | M2.6 | 116 km | 1 km |
| Apr 29, 2010 | 3 km SW of Centerton, Arkansas | M2.5 | 117 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
642 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 219 fatalities, 2,167 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2011 | EF5 | 48 km | 21.6 mi | 158 |
| May 10, 2008 | EF4 | 19 km | 75.5 mi | 21 |
| May 4, 2003 | EF4 | 28 km | 33.0 mi | 4 |
| Apr 26, 1991 | EF4 | 96 km | 4.0 mi | 0 |
| Apr 24, 1975 | EF4 | 60 km | 11.9 mi | 3 |
| Sep 27, 1959 | EF4 | 37 km | 20.4 mi | 1 |
| Apr 3, 1956 | EF4 | 46 km | 41.8 mi | 0 |
| May 22, 2019 | EF3 | 79 km | 11.3 mi | 3 |
| May 22, 2019 | EF3 | 44 km | 9.2 mi | 0 |
| May 22, 2011 | EF3 | 79 km | 17.9 mi | 0 |
| Apr 21, 2005 | EF3 | 35 km | 5.0 mi | 0 |
| May 4, 2003 | EF3 | 17 km | 25.0 mi | 5 |
| May 4, 2003 | EF3 | 86 km | 49.0 mi | 7 |
| May 4, 2003 | EF3 | 69 km | 86.0 mi | 5 |
| Apr 19, 2000 | EF3 | 39 km | 34.0 mi | 0 |
| May 17, 1995 | EF3 | 93 km | 14.0 mi | 0 |
| Mar 26, 1983 | EF3 | 47 km | 7.0 mi | 0 |
| Mar 15, 1982 | EF3 | 33 km | 30.0 mi | 1 |
| Mar 15, 1982 | EF3 | 68 km | 6.0 mi | 1 |
| Mar 15, 1982 | EF3 | 44 km | 9.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (51,112 acres, 2014).
| Year | Name | Acres Burned | Distance |
| 2014 | UNNAMED | 51,112 | 71 km |
| 2014 | UNNAMED | 20,760 | 84 km |
| 2004 | UNNAMED | 19,648 | 91 km |
| 2015 | WOLF CREEK | 18,077 | 69 km |
| 2014 | UNNAMED | 17,075 | 93 km |
| 2016 | BAR-DEW LAKE | 14,806 | 91 km |
| 1996 | UNNAMED | 13,265 | 86 km |
| 2016 | MUSTANG | 10,060 | 98 km |
| 2004 | UNNAMED | 6,373 | 76 km |
| 1996 | UNNAMED | 5,691 | 95 km |
| 2002 | HULAH2 | 5,421 | 94 km |
| 2022 | 18 VALLEY | 5,181 | 98 km |
| 2003 | UNNAMED | 4,671 | 96 km |
| 2024 | ROBERT | 4,610 | 98 km |
| 2004 | UNNAMED | 4,424 | 41 km |
| 2018 | ONION PRAIRIE | 3,917 | 100 km |
| 2023 | HICKEY | 3,728 | 92 km |
| 2015 | LITTLE DEER | 3,709 | 81 km |
| 1995 | UNNAMED | 3,676 | 97 km |
| 1986 | UNNAMED | 3,427 | 50 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 1.4 in | Coldest, Driest |
| February | 38°F (3°C) | 1.6 in | |
| March | 48°F (9°C) | 3.4 in | |
| April | 57°F (14°C) | 3.9 in | |
| May | 66°F (19°C) | 5.4 in | Wettest |
| June | 75°F (24°C) | 4.9 in | |
| July | 79°F (26°C) | 3.2 in | Warmest |
| August | 79°F (26°C) | 3.7 in | |
| September | 71°F (21°C) | 4.9 in | |
| October | 59°F (15°C) | 4.0 in | |
| November | 46°F (8°C) | 3.2 in | |
| December | 36°F (2°C) | 1.9 in |
Oswego has a seasonal temperature swing of 47°F / from 32°F in January to 79°F in July. Total annual precipitation is 41.4 inches, with May being the wettest month (5.4") and January the driest (1.4").