The Del Rio 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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Partly cloudy
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25° on Nov. 16, 1916, the coldest reading for this week of the year since 1905. Next is 25° in 2018.
Del Rio’s center stands about 970 ft above sea level. Within three miles the land runs from 880 ft to 1,080 ft, a difference of 200 ft: gently rolling country.
Under the town center the state geologic map shows Salmon Peak Limestone, from the Early Cretaceous, 100 to 145 million years old.
The section below crosses 6 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.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 7 mi of the line.
Black-shale, siltstone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Limestone. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 million years old. About 1 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 0.9 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.4 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 Del Rio reaches the Gulf of America by way of San Felipe Creek and the Rio Grande: about 570 river miles.
Lake on the way: Paz Ramirez Lake.
270 miles of the trip are on the Rio Grande.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Del Rio; river miles along the main stem, rounded.
Del Rio has a hot semi-arid climate. Summer afternoons average 101° in August; winter nights fall to about 44° in January. About 20 inches of rain fall in a normal year.
On November 14 Del Rio normally reaches 75° and falls to 53°. The record high is 90°, in 1921; the record low 25°, in 2018. The most rain on this date, 1.65 in, fell in 2004.
Normals 1991–2020 and records since 1905 from the Del Rio Area threaded record (Del Rio International Airport, 2 miles west-northwest). NOAA, through RCC-ACIS.
