The Seymour 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.
Showers likely
Showers likely
Mostly cloudy
Partly cloudy; warmer
Partly cloudy
Mostly cloudy
Partly cloudy
92° on Nov. 15, 2025, the hottest reading for this week of the year since 1962. Next is 88° in 2021.
Seymour’s center stands about 1,290 ft above sea level. Within three miles the land runs from 1,250 ft to 1,380 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Terrace deposits (sand), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 9 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.
Claystone. Age: Permian, 252 to 299 million years old. About 6 mi of the line.
Sand. Age: Holocene, less than 12,000 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.
Conglomerate. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Shale. 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. 3 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 Seymour reaches the Gulf of America by way of Seymour Creek and the Brazos: about 850 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 Seymour; river miles along the main stem, rounded.
Seymour has a humid subtropical climate. Summer afternoons average 96° in July; winter nights fall to about 31° in January. About 25 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Seymour normally reaches 65° and falls to 42°. The record high is 85°, in 1989; the record low 14°, in 1986. The most rain on this date, 0.24 in, fell in 1993.
Normals 1991–2020 and records since 1962 at Lake Kemp, 13 miles north-northeast, 120 ft lower. NOAA, through RCC-ACIS.
