The Double Horn 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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24° on Nov. 14, 2018, the coldest reading for this week of the year since 1996. Next is 24° in 2019.
Double Horn’s center stands about 970 ft above sea level. Within three miles the land runs from 720 ft to 1,170 ft, a difference of 450 ft: hilly country. The highest named summit within 15 miles is Howell Mountain, about 1,660 ft, 15 miles west-southwest.
Under the town center the state geologic map shows Honeycut Formation (dolostone, limestone), from the Early Ordovician, 471 to 487 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 20×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 9 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Limestone. Age: Carboniferous, 299 to 324 million years old. About 3 mi of the line.
Dolostone, limestone. Age: Early Ordovician, 471 to 487 million years old. About 3 mi of the line.
Limestone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units along the line are not listed.
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 Double Horn reaches the Gulf of America by way of Gridiron Branch and the Colorado: about 370 river miles.
Lake on the way: Lake Marble Falls.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Double Horn; river miles along the main stem, rounded.
Double Horn has a humid subtropical climate. Summer afternoons average 96° in August; winter nights fall to about 38° in January. About 28 inches of rain fall in a normal year.
On November 14 Double Horn normally reaches 69° and falls to 48°. The record high is 86°, in 2007; the record low 24°, in 2018. The most rain on this date, 0.80 in, fell in 2004.
Normals 1991–2020 and records since 1996 at Burnet Municipal Airport, 17 miles north, 300 ft higher. NOAA, through RCC-ACIS.
