The Port Austin 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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5° on Nov. 16, 1933, the coldest reading for this week of the year since 1887. Next is 9° in 1959.
Port Austin’s center stands about 620 ft above sea level. Within three miles the land runs from 570 ft to 710 ft, a difference of 140 ft: gently rolling country.
Under the town center the state geologic map shows Marshall Sandstone, from the Carboniferous, 324 to 359 million years old.
The section below crosses 2 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.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 13 mi of the line.
Shale. Age: Carboniferous, 324 to 359 million years old. About 0.9 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.
Rain that falls on Port Austin runs straight into Lake Huron. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Port Austin; river miles along the main stem, rounded.
Port Austin has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 16° in January. About 33 inches of rain fall in a normal year.
On November 14 Port Austin normally reaches 46° and falls to 32°. The record high is 65°, in 1989; the record low 12°, in 1986. The most rain on this date, 1.01 in, fell in 1957.
Normals 1991–2020 and records since 1887 at Bad Axe, 17 miles south. NOAA, through RCC-ACIS.
