The Lynn 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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7° on Nov. 13, 2019, the coldest reading for this week of the year since 1968. Next is 10° in 1986.
Lynn’s center stands about 1,180 ft above sea level. Within three miles the land runs from 1,110 ft to 1,230 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Louisville Limestone through Brassfield Limestone, from the Silurian, 422 to 445 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. 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 22 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 1 mi of the line.
Shale, dolostone, limestone. Age: Ordovician, 445 to 487 million years old. About 0.7 mi of the line.
Dolostone, limestone, shale. Age: Silurian, 422 to 445 million years old. About 0.3 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 Lynn reaches the Gulf of America by way of the Greens Fork, the Whitewater, the Great Miami, the Ohio and the Mississippi: about 1,560 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 Lynn; river miles along the main stem, rounded.
Lynn has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 20° in January. About 43 inches of rain fall in a normal year.
On November 14 Lynn normally reaches 52° and falls to 33°. The record high is 74°, in 1971; the record low 10°, in 1986. The most rain on this date, 2.00 in, fell in 1993.
Normals 1991–2020 and records since 1968 at Richmond Water Works, 14 miles south-southeast, 180 ft lower. NOAA, through RCC-ACIS.
