The Porter 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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72° on Nov. 11, 1964, the hottest reading for this week of the year since 1931. Next is 71° in 1971.
Porter’s center stands about 860 ft above sea level. Within three miles the land runs from 790 ft to 1,010 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Liberty Pole Hill, about 1,110 ft, 12 miles west.
Under the town center the state geologic map shows Ancell Group (sandstone), 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 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.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 11 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 6 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 4 mi of the line.
Sandstone. Age: Cambrian, 487 to 542 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 Porter reaches the Gulf of America by way of the Yahara, the Rock River and the Mississippi: about 1,650 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Porter; river miles along the main stem, rounded.
Porter has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 10° in January. A normal year brings about 36 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Porter normally reaches 46° and falls to 27°. The record high is 71°, in 1971; the record low 12°, in 1959. The most rain on this date, 0.70 in, fell in 1980.
Normals 1991–2020 and records since 1931 at Stoughton Wwtp, 7 miles north-northwest. NOAA, through RCC-ACIS.
