The Ashby 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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69° on Nov. 11, 2020, the hottest reading for this week of the year since 1906. Next is 67° in 2022.
Ashby’s center stands about 920 ft above sea level. Within three miles the land runs from 470 ft to 1,370 ft, a difference of 900 ft: steep hill country. The highest named summit within 15 miles is Pack Monadnock Mountain, about 2,270 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Fitchburg Complex (gneiss), from the Early Devonian to Late Devonian, 375 to 405 million years old.
The section below crosses 10 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.
Granofels, schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 7 mi of the line.
Pelitic-schist, metasandstone. Age: Silurian, 434 to 445 million years old. About 4 mi of the line.
Metaclastic. Age: Silurian, 434 to 445 million years old. About 3 mi of the line.
Granite. Age: Early Devonian to Late Devonian, 375 to 405 million years old. About 3 mi of the line.
Gneiss. Age: Early Devonian to Late Devonian, 375 to 405 million years old. About 3 mi of the line.
Quartz-diorite, tonalite, granodiorite. Age: Early Devonian, 394 to 422 million years old. About 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. 4 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 Ashby reaches the Atlantic Ocean by way of Willard Brook, the Squannacook, the Nashua and the Merrimack: about 100 river miles.
55 miles of the trip are on the Merrimack.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Ashby; river miles along the main stem, rounded.
Ashby has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 14° in January. A normal year brings about 75 inches of snow; with the rain, that comes to about 49 inches of water.
Normals 1991–2020 and records since 1906 at Ashburnham, 6 miles southwest, 190 ft higher. NOAA, through RCC-ACIS.
