The Brownsville 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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69° on Nov. 17, 2016, the hottest reading for this week of the year since 1996. Next is 68° in 2023.
Brownsville’s center stands about 1,010 ft above sea level. Within three miles the land runs from 950 ft to 1,130 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Silurian, undivided (dolostone), from the Silurian, 422 to 445 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 49×. 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: Silurian, 422 to 445 million years old. About 10 mi of the line.
Shale, dolostone. Age: Ordovician, 445 to 487 million years old. About 9 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 5 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 Brownsville reaches the Gulf of America by way of Kummel Creek, the East Branch Rock, the Rock River and the Mississippi: about 1,790 river miles.
Lake on the way: Lake Koshkonong.
1,450 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brownsville; river miles along the main stem, rounded.
Brownsville 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 Brownsville 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, 11 miles north, 220 ft lower. NOAA, through RCC-ACIS.
