The Etna 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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68° on Nov. 11, 2020, the hottest reading for this week of the year since 1925. Next is 68° in 2022.
Etna’s center stands about 320 ft above sea level. Within three miles the land runs from 230 ft to 560 ft, a difference of 330 ft: rolling country. The highest named summit within 15 miles is Mount Harris, about 1,260 ft, 7 miles south.
Under the town center the state geologic map shows Silurian - Ordovician Vassalboro Formation (sandstone), from the Late Ordovician to Silurian, 428 to 459 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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 24 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 Etna reaches the Atlantic Ocean by way of the Martin Stream, the East Branch Sebasticook, the Sebasticook and the Kennebec: about 110 river miles.
60 miles of the trip are on the Kennebec.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Etna; river miles along the main stem, rounded.
Etna has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 9° in January. A normal year brings about 75 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Etna normally reaches 46° and falls to 30°. The record high is 63°, in 2005; the record low 8°, in 2019. The most rain on this date, 1.56 in, fell in 2006.
Normals 1991–2020 and records since 1925 from the Bangor Area threaded record (Bangor International Airport, 15 miles east, 170 ft lower). NOAA, through RCC-ACIS.
