The Dean plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Showers likely
Showers likely; cooler
Partly cloudy
Mostly sunny; warmer
Partly cloudy
Partly cloudy
Chance of showers
92° on Nov. 15, 2025, the hottest reading for this week of the year since 1897. Next is 87° in 2021.
Dean’s center stands about 990 ft above sea level. Within three miles the land runs from 930 ft to 1,030 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Petrolia Formation (shale), from the Permian, 252 to 299 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Permian, 252 to 299 million years old. About 16 mi of the line.
Claystone. Age: Permian, 252 to 299 million years old. About 5 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in Dean reaches the Gulf of America by way of Duck Creek, the Little Wichita, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,020 river miles.
830 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dean; river miles along the main stem, rounded.
Dean has a humid subtropical climate. Summer afternoons average 97° in July; winter nights fall to about 30° in January. About 28 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Dean normally reaches 66° and falls to 41°. The record high is 88°, in 2025; the record low 19°, in 1940. The most rain on this date, 0.92 in, fell in 1947.
Normals 1991–2020 and records since 1897 from the Wichita Falls Area threaded record (Wichita Falls Municipal Airport, 7 miles northwest). NOAA, through RCC-ACIS.
