The Oak Grove 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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12° on Nov. 12, 2019, the coldest reading for this week of the year since 1890. Next is 13° in 1940.
Oak Grove’s center stands about 540 ft above sea level. Within three miles the land runs from 510 ft to 610 ft, a difference of 100 ft: gently rolling country.
Under the town center the state geologic map shows Ste. Genevieve and St. Louis Limestones, undivided, from the Carboniferous, 324 to 359 million years old.
The section below crosses 3 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: Carboniferous, 324 to 359 million years old. About 15 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 7 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 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 Oak Grove reaches the Gulf of America by way of the West Fork Red, the Cumberland, the Ohio and the Mississippi: about 1,170 river miles.
Lake on the way: Bards Lake.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Oak Grove; river miles along the main stem, rounded.
Oak Grove has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 28° in January. About 54 inches of rain fall in a normal year.
On November 14 Oak Grove normally reaches 60° and falls to 37°. The record high is 80°, in 1978; the record low 15°, in 1986. The most rain on this date, 2.24 in, fell in 1957.
Normals 1991–2020 and records since 1890 at Clarksville Wwtp, 10 miles south-southeast, 170 ft lower. NOAA, through RCC-ACIS.
