The Jackman 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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73° on Nov. 11, 2020, the hottest reading for this week of the year since 1894. Next is 65° in 2002.
Jackman’s center stands about 1,210 ft above sea level. Within three miles the land runs from 1,150 ft to 1,960 ft, a difference of 810 ft: hilly country. The highest named summit within 15 miles is Coburn Mountain, about 3,700 ft, 12 miles south-southeast.
Under the town center the state geologic map shows Devonian granite, from the Devonian, 359 to 422 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartz-monzonite. Age: Ordovician, 445 to 487 million years old. About 11 mi of the line.
Slate. Age: Devonian, 359 to 422 million years old. About 6 mi of the line.
Slate, graywacke. Age: Ordovician to Silurian, 422 to 487 million years old. About 2 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Mudstone. Age: Ordovician to Devonian, 359 to 487 million years old. About 2 mi of the line.
Mudstone, sandstone. Age: Early Devonian, 410 to 414 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. 1 smaller unit along the line are not listed.
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 Jackman reaches the Atlantic Ocean by way of the Moose and the Kennebec: about 200 river miles.
Lake on the way: Brassua Lake.
160 miles of the trip are on the Kennebec.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jackman; river miles along the main stem, rounded.
Jackman has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 0° in January. A normal year brings about 107 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Jackman normally reaches 42° and falls to 23°. The record high is 58°, in 2010; the record low −4°, in 2019. The most rain on this date, 0.67 in, fell in 1937.
Normals 1991–2020 and records since 1894 at Jackman, here. NOAA, through RCC-ACIS.
