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Weather & Climate in Chelsea, OK
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chelsea enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 37°F in January while summers reach 82°F in July. The area gets 318 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 45. The city sits at an elevation of 715 feet.
Temperature
37°F Jan (3°C)
82°F Jul (28°C)
| Annual Average | 60.1°F |
| 11% above US avg | |
| January Average | 37°F (3°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 318 days/yr |
Geography
| Elevation | 715 ft (218 m) |
| Area | 1.8 sq mi (4.6 km²) |
| Population Density | 1,046/sq mi |
| Coordinates | 36.5320°N, 95.4346°W |
| Timezone | America/Chicago |
| County | Rogers County County |
| Nearest Airport | Grand Lake Regional (NRI) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 45.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 80.1 / 100 |
| Social Vulnerability | 36.4 / 100 |
| Community Resilience | 55.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
676 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.8.
| Sep 3, 2016 | 14 km NW of Pawnee, Oklahoma | M5.8 | 134 km | 6 km |
| Jul 14, 2017 | 10 km WSW of Shamrock, Oklahoma | M4.2 | 135 km | 7 km |
| Sep 18, 2015 | 3 km WNW of Cushing, Oklahoma | M4.1 | 136 km | 0 km |
| Sep 25, 2015 | 1 km W of Cushing, Oklahoma | M4.0 | 136 km | 3 km |
| Jun 8, 2016 | 13 km NNW of Pawnee, Oklahoma | M3.9 | 130 km | 7 km |
| Sep 16, 2017 | 10 km WSW of Shamrock, Oklahoma | M3.8 | 135 km | 7 km |
| Oct 4, 2016 | 15 km NW of Pawnee, Oklahoma | M3.7 | 135 km | 6 km |
| Jun 12, 2015 | 6 km N of Maramec, Oklahoma | M3.7 | 114 km | 0 km |
| Sep 16, 2015 | 2 km WSW of Cushing, Oklahoma | M3.7 | 137 km | 4 km |
| Mar 22, 2017 | 8 km SW of Shamrock, Oklahoma | M3.7 | 133 km | 5 km |
| Sep 9, 2016 | 4 km ENE of Morrison, Oklahoma | M3.7 | 139 km | 7 km |
| Apr 10, 2014 | 5 km E of Morrison, Oklahoma | M3.7 | 138 km | 8 km |
| Jul 21, 2016 | 9 km NW of Morrison, Oklahoma | M3.6 | 150 km | 10 km |
| Mar 21, 2015 | 9 km NW of Morrison, Oklahoma | M3.6 | 149 km | 5 km |
| Sep 3, 2016 | 13 km NW of Pawnee, Oklahoma | M3.6 | 132 km | 6 km |
| Jan 15, 2016 | 6 km S of Ripley, Oklahoma | M3.6 | 147 km | 4 km |
| Apr 4, 2018 | 12 km WSW of Ralston, Oklahoma | M3.6 | 128 km | 5 km |
| Nov 22, 2013 | 6 km SSW of Glencoe, Oklahoma | M3.6 | 142 km | 3 km |
| Feb 1, 2014 | 6 km NNW of Agra, Oklahoma | M3.6 | 147 km | 5 km |
| Jul 14, 2017 | 10 km WSW of Shamrock, Oklahoma | M3.6 | 135 km | 7 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
837 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 221 fatalities, 2,598 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 22, 2011 | EF5 | 95 km | 21.6 mi | 158 |
| May 6, 2024 | EF4 | 85 km | 40.8 mi | 2 |
| May 10, 2008 | EF4 | 58 km | 75.5 mi | 21 |
| Apr 24, 1993 | EF4 | 55 km | 5.5 mi | 7 |
| Apr 26, 1991 | EF4 | 27 km | 4.0 mi | 0 |
| Apr 24, 1975 | EF4 | 83 km | 11.9 mi | 3 |
| Sep 27, 1959 | EF4 | 39 km | 20.4 mi | 1 |
| Apr 3, 1956 | EF4 | 49 km | 41.8 mi | 0 |
| May 25, 2024 | EF3 | 78 km | 7.9 mi | 0 |
| May 25, 2024 | EF3 | 39 km | 23.9 mi | 2 |
| May 22, 2019 | EF3 | 97 km | 9.2 mi | 0 |
| May 22, 2011 | EF3 | 49 km | 17.9 mi | 0 |
| Dec 31, 2010 | EF3 | 98 km | 21.1 mi | 4 |
| Mar 12, 2006 | EF3 | 57 km | 29.0 mi | 0 |
| Mar 12, 2006 | EF3 | 78 km | 25.0 mi | 0 |
| Apr 21, 2005 | EF3 | 99 km | 5.0 mi | 0 |
| May 4, 2003 | EF3 | 75 km | 25.0 mi | 5 |
| Apr 19, 2000 | EF3 | 77 km | 34.0 mi | 0 |
| Jun 1, 1999 | EF3 | 65 km | 2.0 mi | 2 |
| Apr 24, 1993 | EF3 | 57 km | 8.0 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 | 47 km |
| 2014 | UNNAMED | 36,112 | 61 km |
| 2014 | UNNAMED | 32,901 | 75 km |
| 2018 | DRUMB | 30,422 | 78 km |
| 2021 | CANDY CREEK | 23,167 | 56 km |
| 2015 | UNNAMED | 20,347 | 98 km |
| 2004 | UNNAMED | 19,648 | 73 km |
| 2014 | RESERVE | 19,016 | 97 km |
| 2018 | WEST 60 | 18,715 | 98 km |
| 2007 | UNNAMED | 18,089 | 96 km |
| 2015 | WOLF CREEK | 18,077 | 45 km |
| 2014 | UNNAMED | 17,075 | 67 km |
| 2023 | HWY 123 | 14,980 | 57 km |
| 2016 | BAR-DEW LAKE | 14,806 | 63 km |
| 2014 | SPIDER | 14,587 | 91 km |
| 2014 | UNNAMED | 14,119 | 48 km |
| 2004 | UNNAMED | 12,086 | 99 km |
| 2023 | NORTH DRUM | 11,618 | 75 km |
| 2023 | ZINK | 11,332 | 70 km |
| 2017 | MILSAP | 10,879 | 81 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 37°F (3°C) | 1.7 in | Coldest, Driest |
| February | 40°F (4°C) | 2.0 in | |
| March | 49°F (10°C) | 3.7 in | |
| April | 59°F (15°C) | 3.8 in | |
| May | 67°F (19°C) | 4.8 in | |
| June | 75°F (24°C) | 4.8 in | |
| July | 82°F (28°C) | 3.0 in | Warmest |
| August | 80°F (27°C) | 3.3 in | |
| September | 72°F (22°C) | 5.0 in | Wettest |
| October | 61°F (16°C) | 3.7 in | |
| November | 48°F (9°C) | 3.6 in | |
| December | 38°F (4°C) | 2.3 in |
Chelsea has a seasonal temperature swing of 45°F / from 37°F in January to 82°F in July. Total annual precipitation is 41.6 inches, with September being the wettest month (5.0") and January the driest (1.7").