The Granite 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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92° on Nov. 17, 2017, the hottest reading for this week of the year since 1910. Next is 86° in 2021.
Granite’s center stands about 1,620 ft above sea level. Within three miles the land runs from 1,540 ft to 2,000 ft, a difference of 460 ft: hilly country. The highest named summit within 15 miles is King Mountain, about 2,380 ft, 8 miles southeast.
Under the town center the state geologic map shows Hennessey Group (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 25×. 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 8 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 8 mi of the line.
Granite. Age: Middle Cambrian, 497 to 521 million years old. About 7 mi of the line.
Shale, siltstone. Age: Permian, 252 to 299 million years old. About 0.3 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 Granite reaches the Gulf of America by way of the Elm Fork Red, the North Fork Red, the Red River, the Atchafalaya and the Lower Atchafalaya: about 1,200 river miles.
960 miles of the trip are on the Red River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Granite; river miles along the main stem, rounded.
Granite has a humid subtropical climate. Summer afternoons average 97° in July; winter nights fall to about 28° in January. About 28 inches of rain fall in a normal year.
On November 14 Granite normally reaches 62° and falls to 39°. The record high is 84°, in 2020; the record low 14°, in 1916. The most rain on this date, 1.47 in, fell in 1924.
Normals 1991–2020 and records since 1910 at Hobart Municipal Airport, 19 miles east. NOAA, through RCC-ACIS.
