The Koylton 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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76° on Nov. 11, 2022, the hottest reading for this week of the year since 1928. Next is 74° in 2020.
Koylton’s center stands about 830 ft above sea level. Within three miles the land runs from 790 ft to 910 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Michigan Formation (shale), 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.
Shale. Age: Carboniferous, 324 to 359 million years old. About 16 mi of the line.
Sandstone. Age: Carboniferous, 324 to 359 million years old. About 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.
A raindrop that lands in Koylton reaches Lake Huron by way of South Branch White Creek, White Creek, the Cass and the Saginaw: about 95 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
50 miles of the trip are on the Cass.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Koylton; river miles along the main stem, rounded.
Koylton has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 15° in January. A normal year brings about 42 inches of snow; with the rain, that comes to about 34 inches of water.
On November 14 Koylton normally reaches 47° and falls to 31°. The record high is 67°, in 2009; the record low 9°, in 1986. The most rain on this date, 1.10 in, fell in 1959.
Normals 1991–2020 and records since 1928 at Caro Wwtp, 14 miles west-northwest, 140 ft lower. NOAA, through RCC-ACIS.
