The Franklin 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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3.89 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 2.87 inches, fell in 1935.
Franklin’s center stands about 580 ft above sea level. Within three miles the land runs from 500 ft to 1,910 ft, a difference of 1,410 ft: steep hill country. The highest named summit within 15 miles is Buffalo Mountain, about 2,230 ft, 14 miles northwest.
Under the town center the state geologic map shows Wills Creek Formation (shale), from the Silurian, 422 to 445 million years old.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 12×. 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, sandstone. Age: Silurian, 422 to 445 million years old. About 4 mi of the line.
Siltstone, mudstone. Age: Late Devonian, 359 to 384 million years old. About 4 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Quartzite. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Siltstone. Age: Late Devonian, 359 to 384 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. 5 smaller units 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 Franklin reaches Chesapeake Bay and the Atlantic Ocean by way of Middle Creek and the Susquehanna: about 140 river miles.
Lake on the way: Lake Aldred.
75 miles of the trip are on the Susquehanna.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Franklin; river miles along the main stem, rounded.
Franklin has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 19° in January. A normal year brings about 29 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Franklin normally reaches 52° and falls to 32°. The record high is 68°, in 1902; the record low 14°, in 1920. The most rain on this date, 0.69 in, fell in 1988.
Normals 1991–2020 and records since 1893 at Selinsgrove Penn Valley Airport, 11 miles east-northeast, 140 ft lower. NOAA, through RCC-ACIS.
