The Guilford 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 1973. Next is 67° in 2022.
Guilford’s center stands about 420 ft above sea level. Within three miles the land runs from 390 ft to 820 ft, a difference of 430 ft: hilly country. The highest named summit within 15 miles is Russell Mountain, about 2,180 ft, 12 miles west-northwest.
Under the town center the state geologic map shows Silurian Sangerville Formation (shale, sandstone), from the Silurian, 428 to 434 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 12×. 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 12 mi of the line.
Schist. Age: Devonian, 359 to 422 million years old. About 4 mi of the line.
Quartzite, calc-silicate-rock. Age: Silurian to Devonian, 359 to 445 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.
Mudstone, sandstone. Age: Early Devonian, 410 to 414 million years old. About 0.5 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 Guilford reaches the Atlantic Ocean by way of Schoolhouse Brook, the Piscataquis and the Penobscot: about 110 river miles.
60 miles of the trip are on the Penobscot.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Guilford; river miles along the main stem, rounded.
Guilford has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 4° in January. A normal year brings about 77 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Guilford normally reaches 45° and falls to 26°. The record high is 63°, in 2010; the record low 4°, in 1986. The most rain on this date, 1.14 in, fell in 2018.
Normals 1991–2020 and records since 1973 at Dover-Foxcroft Wwtp, 10 miles east. NOAA, through RCC-ACIS.
