The Williamson 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.
Sunny
Mostly sunny; warmer
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79° on Nov. 15, 2005, the hottest reading for this week of the year since 1994. Next is 79° in 2011.
Williamson’s center stands about 900 ft above sea level. Within three miles the land runs from 810 ft to 980 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Dorster Mountain, about 1,280 ft, 15 miles south-southwest.
Under the town center the state geologic map shows Mica Schist/ Gneiss/ Amphibolite (gneiss, mica-schist, amphibolite), from the Precambrian to Paleozoic.
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.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 13 mi of the line.
Granite. Age: Precambrian to Paleozoic. About 10 mi of the line.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 0.7 mi of the line.
Mica-schist. Age: Precambrian to Paleozoic. About 0.4 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 Williamson reaches the Gulf of America by way of Elkins Creek, the Flint and the Apalachicola: about 400 river miles.
270 miles of the trip are on the Flint.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Williamson; river miles along the main stem, rounded.
Williamson has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 34° in January. About 49 inches of rain fall in a normal year.
On November 14 Williamson normally reaches 66° and falls to 41°. The record high is 79°, in 2011; the record low 22°, in 2013. The most rain on this date, 0.79 in, fell in 2024.
Normals 1991–2020 and records since 1994 at Peachtree City Falcon Field, 17 miles northwest, 110 ft lower. NOAA, through RCC-ACIS.
