The Bois Blanc 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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78° on Nov. 11, 2022, the hottest reading for this week of the year since 1891. Next is 71° in 1915.
Bois Blanc’s center stands about 690 ft above sea level. Within three miles the land runs from 570 ft to 730 ft, a difference of 160 ft: gently rolling country.
Under the town center the state geologic map shows Bois Blanc Formation (limestone), from the Early Devonian, 394 to 422 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.
Limestone. Age: Early Devonian, 394 to 422 million years old. About 6 mi of the line.
Dolostone. Age: Middle Devonian, 384 to 394 million years old. About 4 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.
Bois Blanc has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 10° in February. A normal year brings about 88 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Bois Blanc normally reaches 44° and falls to 30°. The record high is 64°, in 1999; the record low 11°, in 1933. The most rain on this date, 0.69 in, fell in 1957.
Normals 1991–2020 and records since 1891 at Cheboygan, 8 miles south, 110 ft lower. NOAA, through RCC-ACIS.
