The Frankfort 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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70° on Nov. 17, 1953, the hottest reading for this week of the year since 1912. Next is 68° in 1964.
Frankfort’s center stands about 1,340 ft above sea level. Within three miles the land runs from 1,250 ft to 1,430 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Granodiorite-tonalite (granodiorite, tonalite), from the Paleoproterozoic, 1.8 to 1.8 billion years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 58×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, amphibolite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 7 mi of the line.
Granodiorite, tonalite. Age: Paleoproterozoic, 1.8 to 1.8 billion years old. About 5 mi of the line.
Mylonite. Age: Archean to Paleoproterozoic. About 5 mi of the line.
Basalt, basaltic-andesite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 3 mi of the line.
Rhyolite, dacite. Age: Paleoproterozoic, 1.8 to 1.8 billion years old. About 3 mi of the line.
Alkali-feldspar-granite. Age: Paleoproterozoic, 1.6 to 2.5 billion 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 Frankfort reaches the Gulf of America by way of Hamann Creek, the Big Eau Pleine, the Wisconsin and the Mississippi: about 1,890 river miles.
Lakes on the way: Petenwell Lake, Lake Wisconsin, Lake Du Bay and Wisconsin River Flowage 4964.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Frankfort; river miles along the main stem, rounded.
Frankfort has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 6° in January. A normal year brings about 57 inches of snow; with the rain, that comes to about 34 inches of water.
On November 14 Frankfort normally reaches 42° and falls to 26°. The record high is 68°, in 1990; the record low 1°, in 1959. The most rain on this date, 0.40 in, fell in 2008.
Normals 1991–2020 and records since 1912 at Marshfield Experiment Farm, 18 miles south, 100 ft lower. NOAA, through RCC-ACIS.
