The Mackinaw 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.
Mackinaw’s center stands about 740 ft above sea level. Within three miles the land runs from 570 ft to 760 ft, a difference of 190 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 45×. 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: Middle Devonian, 384 to 394 million years old. About 11 mi of the line.
Limestone. Age: Early Devonian, 394 to 422 million 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 Mackinaw reaches Lake Huron by way of Mill Creek: about 1 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 Mackinaw; river miles along the main stem, rounded.
Mackinaw 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 Mackinaw 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, 13 miles east-southeast, 160 ft lower. NOAA, through RCC-ACIS.
