The Arnett 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.
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6° on Nov. 13, 2018, the coldest reading for this week of the year since 1904. Next is 6° in 2019.
Arnett’s center stands about 2,450 ft above sea level. Within three miles the land runs from 2,340 ft to 2,510 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Ogallala Formation (fine-detrital, coarse-detrital), from the Pliocene, 2.6 to 5.3 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 49×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Fine-detrital, coarse-detrital. Age: Pliocene, 2.6 to 5.3 million years old. About 15 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Shale, siltstone, sandstone. Age: Permian, 252 to 299 million years old. About 3 mi of the line.
Fine-detrital. Age: Holocene, less than 12,000 years old. About 0.7 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 Arnett reaches the Gulf of America by way of Mosquito Creek, the Canadian, the Arkansas and the Mississippi: about 1,410 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Arnett; river miles along the main stem, rounded.
Arnett has a humid subtropical climate. Summer afternoons average 95° in July; winter nights fall to about 22° in January. About 21 inches of rain fall in a normal year.
On November 14 Arnett normally reaches 62° and falls to 33°. The record high is 85°, in 2025; the record low 7°, in 1959. The most rain on this date, 0.85 in, fell in 1947.
Normals 1991–2020 and records since 1904 at Gage Airport, 11 miles north, 260 ft lower. NOAA, through RCC-ACIS.
