The Errol 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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−6° on Nov. 17, 2019, the coldest reading for this week of the year since 1996. Next is −4° in 2018.
Errol’s center stands about 1,230 ft above sea level. Within three miles the land runs from 1,230 ft to 2,110 ft, a difference of 880 ft: hilly country. The highest named summit within 15 miles is Muise Mountain, about 3,610 ft, 12 miles west.
Under the town center the state geologic map shows Dead River Formation, undivided (pelitic-schist, quartzite), from the Cambrian to Early Ordovician, 471 to 497 million years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 9×. 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-monzodiorite, quartz-diorite. Age: Devonian, 359 to 422 million years old. About 7 mi of the line.
Quartz-diorite. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 3 mi of the line.
Metaclastic. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Granite. Age: Devonian to Carboniferous, 324 to 422 million years old. About 3 mi of the line.
Pelitic-schist, quartzite. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 3 mi of the line.
Schist, granofels. Age: Silurian, 425 to 434 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. 3 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 Errol reaches the Atlantic Ocean by way of Umbagog Lake, the Androscoggin and the Kennebec: about 200 river miles.
Lake on the way: Umbagog Lake.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Errol; river miles along the main stem, rounded.
Errol has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 3° in January. About 36 inches of rain fall in a normal year.
On November 14 Errol normally reaches 45° and falls to 23°. The record high is 66°, in 2011; the record low −1°, in 2019. The most rain on this date, 0.76 in, fell in 2009.
Normals 1991–2020 and records since 1996 at Berlin Regional Airport, 14 miles south, 110 ft lower. NOAA, through RCC-ACIS.
