The Fontana-on-Geneva Lake 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.
Sunny
Mostly sunny; warmer
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Partly cloudy
Mostly sunny
Chance of showers
75° on Nov. 11, 2022, the hottest reading for this week of the year since 1945. Next is 71° in 1964.
Fontana-on-Geneva Lake’s center stands about 920 ft above sea level. Within three miles the land runs from 840 ft to 1,110 ft, a difference of 270 ft: rolling country.
Under the town center the state geologic map shows Maquoketa Formation (shale, dolostone), from the Ordovician, 445 to 487 million years old.
The section below crosses 5 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.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Dolostone, limestone. Age: Silurian, 422 to 445 million years old. About 6 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 3 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 3 mi of the line.
Dolostone. Age: Silurian, 422 to 445 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 Fontana-on-Geneva Lake reaches the Gulf of America by way of Lake Geneva 36, the White River, the Fox River, the Illinois and the Mississippi: about 1,590 river miles.
Lakes on the way: Peoria Lake, Fox Lake and Lake Geneva 36.
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 Fontana-on-Geneva Lake; river miles along the main stem, rounded.
Fontana-on-Geneva Lake has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 15° 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 Fontana-on-Geneva Lake normally reaches 48° and falls to 31°. The record high is 70°, in 1971; the record low 8°, in 1959. The most rain on this date, 1.13 in, fell in 1957.
Normals 1991–2020 and records since 1945 at Lake Geneva Wwtp, 8 miles east-northeast. NOAA, through RCC-ACIS.
