The Sonterra 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.
Chance of showers
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24° on Nov. 13, 2013, the coldest reading for this week of the year since 1980. Next is 24° in 2018.
Sonterra’s center stands about 870 ft above sea level. Within three miles the land runs from 740 ft to 930 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Hog Mountain, about 1,100 ft, 13 miles northwest.
Under the town center the state geologic map shows Austin Chalk (marlstone, chalk), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 37×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Marlstone, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Limestone, dolostone. Age: Early Cretaceous, 100 to 145 million years old. About 5 mi of the line.
Gravel. Age: Pleistocene, less than 2.6 million years old. About 4 mi of the line.
Limestone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 3 mi of the line.
Siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 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. 1 smaller unit 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 Sonterra reaches the Gulf of America by way of Donahoe Creek, the Little River and the Brazos: about 430 river miles.
320 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sonterra; river miles along the main stem, rounded.
Sonterra has a humid subtropical climate. Summer afternoons average 97° in August; winter nights fall to about 36° in January. About 37 inches of rain fall in a normal year.
On November 14 Sonterra normally reaches 70° and falls to 47°. The record high is 86°, in 2006; the record low 26°, in 2018. The most rain on this date, 0.41 in, fell in 1998.
Normals 1991–2020 and records since 1980 at Georgetown Lake, 12 miles southwest. NOAA, through RCC-ACIS.
