The Savannah 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; warmer
Partly cloudy
Partly cloudy
Partly cloudy
Mostly sunny
90° on Nov. 15, 2025, the hottest reading for this week of the year since 1996. Next is 86° in 1999.
Savannah’s center stands about 580 ft above sea level. Within three miles the land runs from 510 ft to 610 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Eagle Ford Formation (black-shale, siltstone), from the Late Cretaceous, 66 to 100 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 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.
Black-shale, siltstone. Age: Late Cretaceous, 66 to 100 million years old. About 9 mi of the line.
Sandstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Marlstone, chalk. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 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 Savannah reaches Galveston Bay and the Gulf of America by way of Lake Lewisville, the Elm Fork Trinity and the Trinity: about 500 river miles.
Lakes on the way: Woodlands Golf Course Lake and Lake Lewisville.
270 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Savannah; river miles along the main stem, rounded.
Savannah has a humid subtropical climate. Summer afternoons average 96° in July; winter nights fall to about 32° in January. About 36 inches of rain fall in a normal year.
On November 14 Savannah normally reaches 67° and falls to 43°. The record high is 86°, in 1999; the record low 21°, in 2018. The most rain on this date, 0.38 in, fell in 2022.
Normals 1991–2020 and records since 1996 at Denton Municpal Airport, 17 miles west. NOAA, through RCC-ACIS.
