The Cumming 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.
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4.32 inches of rain fell in two days, the most for this week of the year since records began in 1891. The next wettest, 4.29 inches, fell in 1968.
Cumming’s center stands about 1,260 ft above sea level. Within three miles the land runs from 1,060 ft to 1,630 ft, a difference of 570 ft: hilly country. The highest named summit within 15 miles is Sawnee Mountain, about 1,940 ft, 3 miles northwest.
Under the town center the state geologic map shows Aluminous Schist, from the Precambrian to Paleozoic.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 26×. 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 16 mi of the line.
Schist. Age: Precambrian to Paleozoic. About 3 mi of the line.
Gneiss. Age: Precambrian to Paleozoic. About 2 mi of the line.
Age: Precambrian to Paleozoic. About 2 mi of the line.
Mica-schist, amphibolite. Age: Precambrian to Paleozoic. About 1 mi of the line.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 0.5 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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 Cumming reaches the Gulf of America by way of Kelley Mill Branch, Big Creek, the Chattahoochee and the Apalachicola: about 450 river miles.
Lakes on the way: Walter F George Reservoir, West Point Lake and Bartletts Ferry Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Cumming; river miles along the main stem, rounded.
Cumming has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 31° in January. About 56 inches of rain fall in a normal year, with about 2 inches of snow.
On November 14 Cumming normally reaches 62° and falls to 40°. The record high is 79°, in 1931; the record low 20°, in 1911. The most rain on this date, 1.18 in, fell in 1898.
Normals 1991–2020 and records since 1891 at Gainesville, 17 miles east-northeast. NOAA, through RCC-ACIS.
