The Jeffersontown 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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13° on Nov. 17, 1959, the coldest reading for this week of the year since 1872. Next is 15° in 1986.
Jeffersontown’s center stands about 700 ft above sea level. Within three miles the land runs from 570 ft to 750 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Brooks Hill, about 910 ft, 13 miles southwest.
Under the town center the state geologic map shows Laurel Dolomite, Osgood Formation, and Brassfield Dolomite, undivided (dolostone), from the Silurian, 422 to 445 million years old.
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 51×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Silurian, 422 to 445 million years old. About 6 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Limestone. Age: Early Devonian to Middle Devonian, 384 to 422 million years old. About 4 mi of the line.
Coarse-detrital, fine-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 2 mi of the line.
Dolostone. Age: Silurian, 422 to 445 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. 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 Jeffersontown reaches the Gulf of America by way of Chenoweth Run, the Floyds Fork, the Salt River, the Ohio and the Mississippi: about 1,370 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jeffersontown; river miles along the main stem, rounded.
Jeffersontown has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 28° in January. A normal year brings about 13 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Jeffersontown normally reaches 58° and falls to 40°. The record high is 79°, in 1902; the record low 15°, in 1986. The most rain on this date, 1.44 in, fell in 1929.
Normals 1991–2020 and records since 1872 from the Louisville Area threaded record (Louisville International Airport, 9 miles west, 220 ft lower). NOAA, through RCC-ACIS.
