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.
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3.62 inches of rain fell in two days, the most for this week of the year since records began in 1899. The next wettest, 3.27 inches, fell in 1992.
Savannah’s center stands about 1,110 ft above sea level. Within three miles the land runs from 1,010 ft to 1,230 ft, a difference of 220 ft: rolling country.
Under the town center the state geologic map shows Maxville Limestone; Rushville, Logan, and Cuyhoga Formations, Undivided (shale, siltstone, sandstone), from the Devonian to Carboniferous, 324 to 422 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 48×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, siltstone, sandstone. Age: Devonian to Carboniferous, 324 to 422 million years old. About 24 mi of the line.
Black-shale. Age: Carboniferous, 324 to 359 million years old. 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 Savannah reaches Lake Erie by way of the Vermilion: about 60 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
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 hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. A normal year brings about 49 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Savannah normally reaches 50° and falls to 34°. The record high is 71°, in 1971; the record low 11°, in 1986. The most rain on this date, 3.11 in, fell in 1993.
Normals 1991–2020 and records since 1899 from the Mansfield Area threaded record (Mansfield Lahm Regional Airport, 13 miles southwest, 180 ft higher). NOAA, through RCC-ACIS.
