The Tamms 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. 13, 2019, the coldest reading for this week of the year since 1923. Next is 16° in 1997.
Tamms’s center stands about 350 ft above sea level. Within three miles the land runs from 320 ft to 610 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Italian Hill, about 900 ft, 6 miles north-northwest.
Under the town center the state geologic map shows Tamms Group (limestone), from the Silurian to Early Devonian, 394 to 425 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 36×. 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 to Early Devonian, 394 to 425 million years old. About 15 mi of the line.
Shale, sandstone. Age: Paleocene to Pliocene, 2.6 to 66 million years old. About 6 mi of the line.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Sandstone, shale. Age: Late Cretaceous, 66 to 84 million years old. About 1 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 Tamms reaches the Gulf of America by way of Sandy Creek, the Old Channel, the Cache and the Mississippi: about 1,000 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Tamms; river miles along the main stem, rounded.
Tamms has a humid subtropical climate. Summer afternoons average 89° in July; winter nights fall to about 26° in January. A normal year brings about 7 inches of snow; with the rain, that comes to about 49 inches of water.
On November 14 Tamms normally reaches 58° and falls to 39°. The record high is 75°, in 1999; the record low 14°, in 2019. The most rain on this date, 1.04 in, fell in 2024.
Normals 1991–2020 and records since 1923 at Olmsted Lock And Dam, 12 miles east-southeast. NOAA, through RCC-ACIS.
