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Southwestern Oklahoma facts for kids

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The Antelope Hills of Southwest Oklahoma in the distance
Wichita Mountains Narrows
Wichita Mountains Narrows

Southwest Oklahoma is a geographical name for the southwest portion of the state of Oklahoma, typically considered to be south of the Canadian River, extending eastward from the Texas border to a line roughly from Weatherford, to Anadarko, to Duncan. Geologically, the region is defined by a failed continental rift known as the Southern Oklahoma Aulacogen. The austere nature of the prairie landscape with intermittent island ranges has made it a favorable place for artists and photographers alike.

Anchored by Lawton, its largest city, Southwest Oklahoma's other important urban centers include Elk City, Clinton, Weatherford, Walters, Altus, and Duncan.


One section of the 1890 Organic Act established that a lawsuit should be filed to clarify the boundary between Oklahoma and Texas. The U.S. Supreme Court ruled in 1896 that what had been considered part of Texas would now be part of Oklahoma Territory. The area makes up the southwestern corner of Oklahoma and today consists of Beckham County, Harmon County, Jackson County, and Greer County.

Another portion of Southwestern Oklahoma was opened up through the Land Run of 1892. Land formerly owned by the Cheyenne and Arapaho tribes became Oklahoma Territory and today includes Blaine County, Dewey County, Custer County, and Roger Mills County and Washita County.


Wichita Canyon
A canyon in the Wichita Mountains near Lawton.

Consisting of grassland and gently rolling hills, Southwest Oklahoma is atypical to the rest of the Great Plains region of the United States, as it is less dry than adjacent West Texas and contains many geographic features which further differentiates the unique climate. The area has a humid subtropical climate, receiving anywhere from about 20 inches of precipitation annually in the far west, to 35 inches annually in the eastern section. Monsoon-like rains are common in the spring months, while periods of drought can occur throughout other parts of the year.

The region has several small, sky island mountain ranges, the largest of which being the Wichita Mountains, considered by geologists to be one of the oldest mountain ranges in the world.

Mount Sheridan, Oklahoma
Mount Sheridan

The region is known for its many rare, relic plant species, acting as the northern and western boundaries for many iconic plant species such as the escarpment live oak, nolina, bigtooth maple, and sugar maple.

Significant geographic landmarks include the Black Kettle National Grassland, the Taovayan Valley, the Wichita Mountains, the Antelope Hills, and the Quartz Mountains.


Southwestern Oklahoma has a humid subtropical climate with frequent variations in weather.

The average mean temperature for Southwestern Oklahoma is 61.9 °F (16.6 °C). The summers have an average 21 days with temperatures 100 °F (37.8 °C) and above. The area averages eight days that fail to rise above freezing. The region receives about 31.6 inches (800 mm) of precipitation.

Typically in late April through early June, Southwestern Oklahoma is prone to severe weather which can include tornadoes. Notably in 1957, an F4 tornado and again in 1979 an F3 tornado struck the southern region of Lawton.

Wichita Mountains - Oklahoma (5339668791)
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