The Chisholm 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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74° on Nov. 11, 2020, the hottest reading for this week of the year since 1993. Next is 67° in 2002.
Chisholm’s center stands about 380 ft above sea level. Within three miles the land runs from 290 ft to 950 ft, a difference of 660 ft: hilly country. The highest named summit within 15 miles is Saddleback Mountain, about 2,540 ft, 13 miles northwest.
Under the town center the state geologic map shows Silurian Sangerville Formation, Anasagunticook member (metasandstone), from the Silurian, 434 to 445 million years old.
The section below crosses 13 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 15×. 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, sandstone. Age: Silurian, 428 to 434 million years old. About 5 mi of the line.
Metasandstone. Age: Silurian, 434 to 445 million years old. About 4 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Marble. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
Metasiltstone, pelitic-schist. 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. 7 smaller units 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 Chisholm reaches the Atlantic Ocean by way of the Androscoggin and the Kennebec: about 85 river miles.
65 miles of the trip are on the Androscoggin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Chisholm; river miles along the main stem, rounded.
Chisholm has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 7° in January. A normal year brings about 86 inches of snow; with the rain, that comes to about 49 inches of water.
Normals 1991–2020 and records since 1993 at New Sharon, 14 miles northeast, 100 ft higher. NOAA, through RCC-ACIS.
