The Fond du Lac 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. 17, 1931, the hottest reading for this week of the year since 1893. Next is 71° in 1927.
Fond du Lac’s center stands about 770 ft above sea level. Within three miles the land runs from 740 ft to 890 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Mary Hill, about 1,090 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 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 43×. 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 9 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 0.8 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 Fond du Lac reaches Lake Michigan by way of the East Branch Fond Du Lac, the Fond du Lac and the Fox River: about 75 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Lake on the way: Lake Winnebago 6124.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Fond du Lac; river miles along the main stem, rounded.
Fond du Lac has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 9° in January. A normal year brings about 38 inches of snow; with the rain, that comes to about 31 inches of water.
On November 14 Fond du Lac normally reaches 43° and falls to 28°. The record high is 69°, in 1971; the record low 1°, in 1916. The most rain on this date, 0.80 in, fell in 1957.
Normals 1991–2020 and records since 1893 at Fond Du Lac Wwtp, here. NOAA, through RCC-ACIS.
