The Casco 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.
Mostly cloudy
Partly cloudy; warmer
Partly cloudy
Mostly sunny
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71° on Nov. 11, 2020, the hottest reading for this week of the year since 1995. Next is 71° in 2022.
Casco’s center stands about 460 ft above sea level. Within three miles the land runs from 310 ft to 800 ft, a difference of 490 ft: hilly country. The highest named summit within 15 miles is Pleasant Mountain, about 1,990 ft, 15 miles west.
Under the town center the state geologic map shows Carboniferous alkali feldspar granite (muscovite accessory mineral), from the Carboniferous, 299 to 359 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 25×. 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: Carboniferous, 299 to 359 million years old. About 20 mi of the line.
Granite. Age: Carboniferous, 299 to 359 million years old. About 3 mi of the line.
Shale, sandstone. Age: Silurian, 428 to 434 million years old. About 1 mi of the line.
Granite. Age: Devonian, 359 to 422 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.
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 Casco reaches the Atlantic Ocean by way of Mill Brook, the Crooked River and the Presumpscot: about 50 river miles.
Lake on the way: Sebago Lake Basin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Casco; river miles along the main stem, rounded.
Casco has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 14° in January. A normal year brings about 84 inches of snow; with the rain, that comes to about 50 inches of water.
On November 14 Casco normally reaches 47° and falls to 32°. The record high is 63°, in 2011; the record low 12°, in 2019. The most rain on this date, 4.20 in, fell in 2009.
Normals 1991–2020 and records since 1995 at Gray, 16 miles east-southeast. NOAA, through RCC-ACIS.
