The Koehler 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.
Koehler’s center stands about 700 ft above sea level. Within three miles the land runs from 580 ft to 910 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Gray Hill, about 1,180 ft, 12 miles west-southwest.
Under the town center the state geologic map shows Traverse Group (limestone), from the Middle Devonian, 384 to 394 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 35×. 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: Middle Devonian, 384 to 394 million years old. About 19 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 4 mi of the line.
Black-shale, limestone. Age: Middle Devonian, 384 to 394 million years old. About 1 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 Koehler reaches Lake Huron by way of the Little Pigeon and the Cheboygan: about 20 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Lake on the way: Mullett Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Koehler; river miles along the main stem, rounded.
Koehler 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 Koehler 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, 16 miles north, 120 ft lower. NOAA, through RCC-ACIS.
