The Geronimo 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
Showers likely
Mostly cloudy; cooler
Mostly sunny
Mostly cloudy
Chance of showers
Partly cloudy
23° on Nov. 14, 2018, the coldest reading for this week of the year since 1996. Next is 29° in 2011.
Geronimo’s center stands about 590 ft above sea level. Within three miles the land runs from 550 ft to 680 ft, a difference of 130 ft: gently rolling country. The highest named summit within 15 miles is Mission Hill, about 970 ft, 12 miles west-northwest.
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 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 44×. 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 12 mi of the line.
Limestone, carbonate. Age: Late Cretaceous, 66 to 72 million years old. About 4 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 3 mi of the line.
Clay, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 0.9 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 Geronimo reaches the Gulf of America by way of Geronimo Creek, the Guadalupe and the South Guadalupe: about 260 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Geronimo; river miles along the main stem, rounded.
Geronimo 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, 6 miles northwest. NOAA, through RCC-ACIS.
