The Vassalboro 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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71° on Nov. 11, 2020, the hottest reading for this week of the year since 1895. Next is 71° in 2022.
Vassalboro’s center stands about 180 ft above sea level. Within three miles the land runs from 10 ft to 410 ft, a difference of 400 ft: rolling country. The highest named summit within 15 miles is McGaffey Mountain, about 1,290 ft, 15 miles west-northwest.
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 29×. 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 8 mi of the line.
Shale, sandstone. Age: Silurian, 428 to 434 million years old. About 6 mi of the line.
Schist, slate. Age: Silurian, 428 to 445 million years old. About 4 mi of the line.
Mudstone. Age: Silurian, 422 to 445 million years old. About 2 mi of the line.
Mudstone. Age: Ordovician to Silurian, 422 to 487 million years old. About 0.9 mi of the line.
Marble, calc-silicate-rock, metasedimentary. Age: Silurian, 428 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. 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 Vassalboro reaches the Atlantic Ocean by way of Sevenmile Brook and the Kennebec: about 60 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Vassalboro; river miles along the main stem, rounded.
Vassalboro has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 9° in January. About 43 inches of rain fall in a normal year.
On November 14 Vassalboro normally reaches 47° and falls to 29°. The record high is 66°, in 1930; the record low 7°, in 1905. The most rain on this date, 1.01 in, fell in 1904.
Normals 1991–2020 and records since 1895 at Waterville Treatment Plt, 5 miles north-northeast, 120 ft lower. NOAA, through RCC-ACIS.
