The Sussex 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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75° on Nov. 11, 2022, the hottest reading for this week of the year since 1944. Next is 71° in 1971.
Sussex’s center stands about 950 ft above sea level. Within three miles the land runs from 830 ft to 1,090 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Holy Hill, about 1,350 ft, 9 miles northwest.
Under the town center the state geologic map shows Silurian, undivided (dolostone), from the Silurian, 422 to 445 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 47×. 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: Silurian, 422 to 445 million years old. About 18 mi of the line.
Dolostone. 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 2 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 Sussex reaches the Gulf of America by way of the Pewaukee, the Fox River, the Illinois and the Mississippi: about 1,620 river miles.
Lakes on the way: Peoria Lake and Fox Lake.
1,190 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sussex; river miles along the main stem, rounded.
Sussex has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 11° in January. A normal year brings about 54 inches of snow; with the rain, that comes to about 34 inches of water.
On November 14 Sussex normally reaches 46° and falls to 28°. The record high is 68°, in 1989; the record low 1°, in 1986. The most rain on this date, 0.91 in, fell in 1957.
Normals 1991–2020 and records since 1944 at Germantown Wastewater Utility, 9 miles northeast. NOAA, through RCC-ACIS.
