The Summit 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 1893. Next is 71° in 1971.
Summit’s center stands about 900 ft above sea level. Within three miles the land runs from 850 ft to 960 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Lapham Hill, about 1,250 ft, 4 miles east-southeast.
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 53×. 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 15 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 8 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 0.7 mi of the line.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 0.1 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 Summit reaches the Gulf of America by way of the Bark, the Rock River and the Mississippi: about 1,710 river miles.
Lake on the way: Lake Koshkonong.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Summit; river miles along the main stem, rounded.
Summit has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 11° in January. A normal year brings about 40 inches of snow; with the rain, that comes to about 37 inches of water.
On November 14 Summit normally reaches 47° and falls to 29°. The record high is 69°, in 1999; the record low 9°, in 1995. The most rain on this date, 1.00 in, fell in 1957.
Normals 1991–2020 and records since 1893 at Oconomowoc Wwtp, 4 miles north-northwest. NOAA, through RCC-ACIS.
