The Munro 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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−5° on Nov. 15, 1959, the coldest reading for this week of the year since 1948. Next is −5° in 2019.
Munro’s center stands about 820 ft above sea level. Within three miles the land runs from 710 ft to 890 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Mount Pisage, about 990 ft, 12 miles west-southwest.
Under the town center the state geologic map shows Detroit River Group (dolostone), from the Middle Devonian, 384 to 394 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 31×. 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 15 mi of the line.
Limestone. Age: Early Devonian, 394 to 422 million years old. About 2 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 2 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 2 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 Munro reaches Lake Huron by way of Douglas Lake, the Maple, the Indian and the Cheboygan: about 50 river miles. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Lakes on the way: Burt Lake, Mullett Lake and Douglas Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Munro; river miles along the main stem, rounded.
Munro has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 7° in February. About 30 inches of rain fall in a normal year.
On November 14 Munro normally reaches 44° and falls to 28°. The record high is 61°, in 2016; the record low −1°, in 1996. The most rain on this date, 1.52 in, fell in 1957.
Normals 1991–2020 and records since 1948 at Pellston Regional Airport, 7 miles west-southwest, 110 ft lower. NOAA, through RCC-ACIS.
