The Platteville 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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−3° on Nov. 17, 1959, the coldest reading for this week of the year since 1893. Next is −1° in 1986.
Platteville’s center stands about 990 ft above sea level. Within three miles the land runs from 800 ft to 1,060 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Platte Mounds, about 1,470 ft, 4 miles east-northeast.
Under the town center the state geologic map shows Sinnipee Group (dolostone), from the Ordovician, 445 to 487 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 30×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 18 mi of the line.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 4 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 1 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 0.6 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 Platteville reaches the Gulf of America by way of Blockhouse Creek, Snowden Branch, the Little Platte, the Platte and the Mississippi: about 1,580 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Platteville; river miles along the main stem, rounded.
Platteville has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 9° in January. A normal year brings about 37 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Platteville normally reaches 44° and falls to 28°. The record high is 72°, in 1999; the record low 2°, in 1986. The most rain on this date, 0.81 in, fell in 1902.
Normals 1991–2020 and records since 1893 at Lancaster 4 WSW, 17 miles west-northwest. NOAA, through RCC-ACIS.
