The Windham 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. 12, 2022, the hottest reading for this week of the year since 1871. Next is 72° in 1896.
Windham’s center stands about 260 ft above sea level. Within three miles the land runs from 170 ft to 510 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is White Mountain, about 1,100 ft, 15 miles west-northwest.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 33×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 11 mi of the line.
Granite. Age: Carboniferous, 299 to 359 million years old. About 8 mi of the line.
Schist, slate. Age: Silurian, 428 to 445 million years old. About 3 mi of the line.
Marble, calc-silicate-rock, metasedimentary. Age: Silurian, 428 to 445 million years old. About 2 mi of the line.
Granite. Age: Devonian, 359 to 422 million years old. About 0.8 mi of the line.
Slate. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 0.2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Windham reaches the Atlantic Ocean by way of Black Brook and the Presumpscot: about 20 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Windham; river miles along the main stem, rounded.
Windham has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 16° in January. A normal year brings about 69 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Windham normally reaches 49° and falls to 32°. The record high is 69°, in 1973; the record low 12°, in 1986. The most rain on this date, 5.03 in, fell in 2009.
Normals 1991–2020 and records since 1871 from the Portland Area threaded record (Portland Jetport, 12 miles south-southeast, 220 ft lower). NOAA, through RCC-ACIS.
