The Georgetown 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.
Partly cloudy
Showers likely
Mostly cloudy
Mostly sunny; warmer
Mostly cloudy
Partly cloudy
Partly cloudy
24° on Nov. 13, 2013, the coldest reading for this week of the year since 1980. Next is 24° in 2018.
Georgetown’s center stands about 770 ft above sea level. Within three miles the land runs from 660 ft to 900 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Barnett Knob, about 1,150 ft, 14 miles northwest.
Under the town center the state geologic map shows Del Rio Clay and Georgetown Limestone, undivided (clay, limestone), from the Late Cretaceous, 66 to 100 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 40×. 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, dolostone. Age: Early Cretaceous, 100 to 145 million years old. About 9 mi of the line.
Marlstone, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 5 mi of the line.
Sand. Age: Pleistocene to Holocene, 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 2 mi of the line.
Clay, limestone. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 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 Georgetown reaches the Gulf of America by way of Pecan Branch, the San Gabriel, the Little River and the Brazos: about 420 river miles.
Lake on the way: Granger Lake.
320 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Georgetown; river miles along the main stem, rounded.
Georgetown 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 Georgetown 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, 4 miles northwest, 100 ft higher. NOAA, through RCC-ACIS.
