The Pembroke 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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65° on Nov. 14, 2005, the hottest reading for this week of the year since 1994. Next is 65° in 2012.
Pembroke’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 230 ft, a difference of 230 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Carlisle Mountain, about 570 ft, 6 miles north-northwest.
Under the town center the state geologic map shows Silurian Leighton Formation, mafic to felsic volcanic rock member (felsic-volcanic, mafic-volcanic), from the Silurian, 422 to 445 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 50×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Felsic-volcanic, mafic-volcanic. Age: Silurian, 422 to 445 million years old. About 5 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Gabbro, diorite, ultramafic. Age: Devonian, 359 to 422 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 445 million years old. About 0.9 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.
Rain that falls on Pembroke runs straight into the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Pembroke; river miles along the main stem, rounded.
Pembroke has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 11° in January. A normal year brings about 95 inches of snow; with the rain, that comes to about 55 inches of water.
On November 14 Pembroke normally reaches 46° and falls to 31°. The record high is 65°, in 2005; the record low 15°, in 2019. The most rain on this date, 1.21 in, fell in 2006.
Normals 1991–2020 and records since 1994 at Robbinston, 9 miles north-northeast. NOAA, through RCC-ACIS.
