The Cisco 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
Mostly sunny; warmer
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Partly cloudy
89° on Nov. 16, 2025, the hottest reading for this week of the year since 1911. Next is 87° in 2005.
Cisco’s center stands about 1,650 ft above sea level. Within three miles the land runs from 1,540 ft to 1,710 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Harpersville Formation (siltstone-mudstone), from the Carboniferous to Permian, 252 to 324 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 49×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone-mudstone. Age: Carboniferous to Permian, 252 to 324 million years old. About 10 mi of the line.
Black-shale. Age: Carboniferous, 299 to 324 million years old. About 9 mi of the line.
Sandstone, claystone. Age: Early Cretaceous, 100 to 145 million years old. About 4 mi of the line.
Claystone. Age: Permian, 252 to 299 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.
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 Cisco reaches the Gulf of America by way of Sandy Creek, Big Sandy Creek, Hubbard Creek, the Clear Fork and the Brazos: about 840 river miles.
Lakes on the way: Possum Kingdom Lake and Lake Granbury.
550 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cisco; river miles along the main stem, rounded.
Cisco has a humid subtropical climate. Summer afternoons average 96° in July; winter nights fall to about 32° in January. About 29 inches of rain fall in a normal year, with about 4 inches of snow.
On November 14 Cisco normally reaches 67° and falls to 42°. The record high is 85°, in 1989; the record low 18°, in 2013. The most rain on this date, 2.10 in, fell in 1954.
Normals 1991–2020 and records since 1911 at Putnam, 12 miles west. NOAA, through RCC-ACIS.
