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.
Mostly sunny
Mostly sunny; warmer
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Partly cloudy
Chance of showers
69° on Nov. 17, 2016, the hottest reading for this week of the year since 1996. Next is 68° in 2023.
Fond du Lac’s center stands about 860 ft above sea level. Within three miles the land runs from 760 ft to 880 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Mary Hill, about 1,090 ft, 7 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 48×. 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 8 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 6 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 Fond du Lac reaches Lake Michigan by way of the East Branch Fond Du Lac and the Fox River: about 80 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 82° in July; winter nights fall to about 11° in January. About 28 inches of rain fall in a normal year.
On November 14 Fond du Lac normally reaches 45° and falls to 29°. The record high is 64°, in 2025; the record low 10°, in 1996. The most rain on this date, 0.10 in, fell in 2024.
Normals 1991–2020 and records since 1996 at Fond Du Lac County Airport, here. NOAA, through RCC-ACIS.
