The Union 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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22° on Nov. 13, 2019, the coldest reading for this week of the year since 1995. Next is 25° in 1997.
Union Grove’s center stands about 1,030 ft above sea level. Within three miles the land runs from 560 ft to 1,140 ft, a difference of 580 ft: hilly country. The highest named summit within 15 miles is Wallace Mountain, about 1,430 ft, 10 miles north-northwest.
Under the town center the state geologic map shows Pottsville Formation (lower part) (sandstone), from the Carboniferous, 299 to 324 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Carboniferous, 299 to 324 million years old. About 8 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Limestone, dolostone, shale. Age: Carboniferous, 324 to 359 million years old. About 5 mi of the line.
Limestone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Sandstone, conglomerate. Age: Carboniferous, 299 to 324 million years old. About 2 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 0.9 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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 Union Grove reaches the Gulf of America by way of Shoal Creek, the Tennessee, the Ohio and the Mississippi: about 1,360 river miles.
Lakes on the way: Guntersville Lake, White Lake (historical) and Pickwick 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 Union Grove; river miles along the main stem, rounded.
Union Grove has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 32° in January. About 57 inches of rain fall in a normal year.
On November 14 Union Grove normally reaches 62° and falls to 43°. The record high is 74°, in 2011; the record low 22°, in 2019. The most rain on this date, 1.27 in, fell in 2024.
Normals 1991–2020 and records since 1995 at Guntersville No.2, 9 miles southeast, 440 ft lower. NOAA, through RCC-ACIS.
