The Griffin 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
Mostly sunny
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
79° on Nov. 15, 2005, the hottest reading for this week of the year since 1994. Next is 79° in 2011.
Griffin’s center stands about 980 ft above sea level. Within three miles the land runs from 780 ft to 990 ft, a difference of 210 ft: rolling country.
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 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Amphibolite, biotite-gneiss, mica-schist. Age: Precambrian to Paleozoic. About 9 mi of the line.
Granite. Age: Precambrian to Paleozoic. About 8 mi of the line.
Gneiss, mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 8 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.
Griffin straddles the Eastern Continental Divide. Rain on the northeast side runs to the Atlantic Ocean; most of the rest goes to the Gulf of America.
From the center of town, a raindrop reaches the Gulf of America by way of Ison Branch, Potato Creek, the Flint and the Apalachicola: about 400 river miles. One that lands on the northeast side reaches the Atlantic Ocean by way of Cabin Creek, the Towaliga, the Ocmulgee and the Altamaha: about 390 river miles.
240 miles of the trip are on the Flint.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Griffin; river miles along the main stem, rounded.
Griffin 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 Griffin 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, 19 miles west-northwest, 190 ft lower. NOAA, through RCC-ACIS.
