The Algoma 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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2° on Nov. 17, 1959, the coldest reading for this week of the year since 1905. Next is 4° in 1933.
Algoma’s center stands about 580 ft above sea level. Within three miles the land runs from 570 ft to 690 ft, a difference of 120 ft: gently rolling country. The highest named summit within 15 miles is Dhuey Hill, about 950 ft, 10 miles west-northwest.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 60×. 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 12 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 Algoma reaches Lake Michigan by way of the Ahnapee: about 2 river miles. 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 Algoma; river miles along the main stem, rounded.
Algoma has a warm-summer humid continental climate. Summer afternoons average 78° in July; winter nights fall to about 10° in January. A normal year brings about 57 inches of snow; with the rain, that comes to about 33 inches of water.
On November 14 Algoma normally reaches 43° and falls to 29°. The record high is 67°, in 1999; the record low 9°, in 1986. The most rain on this date, 1.09 in, fell in 1957.
Normals 1991–2020 and records since 1905 at Sturgeon Bay Experiment Farm, 19 miles north-northeast, 120 ft higher. NOAA, through RCC-ACIS.
