The Clarksville 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.
Mostly cloudy
Partly cloudy; warmer
Mostly sunny
Sunny
Partly cloudy
Partly cloudy
Partly cloudy
9° on Nov. 17, 1959, the coldest reading for this week of the year since 1892. Next is 10° in 1933.
Clarksville’s center stands about 830 ft above sea level. Within three miles the land runs from 800 ft to 930 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Michigan Formation (shale), from the Carboniferous, 324 to 359 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 56×. 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. Age: Carboniferous, 324 to 359 million years old. About 11 mi of the line.
Sandstone, shale. Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 6 mi of the line.
Shale. Age: Jurassic, 145 to 202 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.
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 Clarksville reaches Lake Michigan by way of Bear Creek, the Coldwater, the Thornapple and the Grand River: about 95 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
60 miles of the trip are on the Grand River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clarksville; river miles along the main stem, rounded.
Clarksville 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 78 inches of snow; with the rain, that comes to about 39 inches of water.
On November 14 Clarksville normally reaches 48° and falls to 33°. The record high is 68°, in 1902; the record low 13°, in 1969. The most rain on this date, 1.41 in, fell in 1957.
Normals 1991–2020 and records since 1892 from the Grand Rapids Area threaded record (Grand Rapids Gerald R Ford International Airport, 14 miles west). NOAA, through RCC-ACIS.
