The Allenstown 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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−1° on Nov. 17, 1967, the coldest reading for this week of the year since 1868. Next is 0° in 1972.
Allenstown’s center stands about 530 ft above sea level. Within three miles the land runs from 290 ft to 750 ft, a difference of 460 ft: hilly country. The highest named summit within 15 miles is Parker Mountain, about 1,410 ft, 14 miles northeast.
Under the town center the state geologic map shows Concord Granite, from the Late Devonian, 359 to 384 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 18×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite. Age: Late Devonian, 359 to 384 million years old. About 9 mi of the line.
Pelitic-schist, metasandstone. Age: Silurian, 434 to 445 million years old. About 5 mi of the line.
Granofels, biotite-schist. Age: Ordovician to Silurian, 422 to 487 million years old. About 3 mi of the line.
Quartzite, metasedimentary. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Gneiss, biotite-schist, granofels. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Metagraywacke. Age: Early Devonian, 410 to 414 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. 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 Allenstown reaches the Atlantic Ocean by way of Boat Meadow Brook, the Suncook and the Merrimack: about 85 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Allenstown; river miles along the main stem, rounded.
Allenstown has a warm-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 13° in January. A normal year brings about 68 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Allenstown normally reaches 49° and falls to 29°. The record high is 71°, in 1989; the record low 7°, in 1986. The most rain on this date, 1.92 in, fell in 2009.
Normals 1991–2020 and records since 1868 from the Concord Area threaded record (Concord Municipal Airport, 7 miles northwest, 190 ft lower). NOAA, through RCC-ACIS.
