The Seguin 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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Mostly cloudy; cooler
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23° on Nov. 14, 2018, the coldest reading for this week of the year since 1996. Next is 29° in 2011.
Seguin’s center stands about 540 ft above sea level. Within three miles the land runs from 470 ft to 580 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Kings Hill, about 750 ft, 9 miles south-southeast.
Under the town center the state geologic map shows Leona Formation (coarse-detrital, fine-detrital), from the Pleistocene, less than 2.6 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 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.
Coarse-detrital, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Clay, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 4 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 4 mi of the line.
Sandstone. Age: Eocene, 34 to 56 million 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. 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 Seguin reaches the Gulf of America by way of Walnut Branch, the Guadalupe and the South Guadalupe: about 250 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Seguin; river miles along the main stem, rounded.
Seguin has a humid subtropical climate. Summer afternoons average 97° in August; winter nights fall to about 40° in January. About 31 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1996 at New Braunfels Municipal Airport, 11 miles north-northwest, 110 ft higher. NOAA, through RCC-ACIS.
