The Trinity 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.
Mostly cloudy
Showers likely; cooler
Chance of showers
Sunny; warmer
Partly cloudy
Partly cloudy
Mostly sunny
8.32 inches of rain fell in two days, the most for this week of the year since records began in 1903. The next wettest, 4.59 inches, fell in 1985.
Trinity’s center stands about 230 ft above sea level. Within three miles the land runs from 130 ft to 310 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Whitsett Formation (clay, sand), from the Late Eocene to Early Oligocene, 28 to 38 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.
Clay, sand. Age: Late Eocene to Early Oligocene, 28 to 38 million years old. About 6 mi of the line.
Sandstone-mudstone. Age: Late Eocene, 34 to 38 million years old. About 4 mi of the line.
Clay, sandstone. Age: Miocene, 5.3 to 23 million years old. About 3 mi of the line.
Sand. Age: Pleistocene, less than 2.6 million years old. About 2 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Sandstone. Age: Late Eocene, 34 to 38 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 Trinity reaches Galveston Bay and the Gulf of America by way of Woodlands Golf Course Lake and the Trinity: about 170 river miles.
Lake on the way: Woodlands Golf Course Lake.
120 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Trinity; river miles along the main stem, rounded.
Trinity has a humid subtropical climate. Summer afternoons average 93° in August; winter nights fall to about 39° in January. About 51 inches of rain fall in a normal year.
On November 14 Trinity normally reaches 68° and falls to 48°. The record high is 89°, in 1959; the record low 25°, in 2019. The most rain on this date, 1.52 in, fell in 1998.
Normals 1991–2020 and records since 1903 at Huntsville, 19 miles south-southwest, 260 ft higher. NOAA, through RCC-ACIS.
