The Tyngsborough 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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76° on Nov. 11, 2020, the hottest reading for this week of the year since 1885. Next is 75° in 1909.
Tyngsborough’s center stands about 170 ft above sea level. Within three miles the land runs from 90 ft to 370 ft, a difference of 280 ft: rolling country. The highest named summit within 15 miles is Birch Hill, about 850 ft, 13 miles northwest.
Under the town center the state geologic map shows Berwick Formation (metaclastic), from the Silurian, 422 to 445 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 36×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Metaclastic. Age: Silurian, 422 to 445 million years old. About 9 mi of the line.
Diorite, tonalite. Age: Silurian to Devonian, 359 to 445 million years old. About 5 mi of the line.
Granite, pegmatite. Age: Ordovician to Silurian, 422 to 487 million years old. About 3 mi of the line.
Metasedimentary, muscovite-schist. Age: Neoproterozoic, 542 to 1,000 million years old. About 3 mi of the line.
Granite. Age: Middle Devonian to Late Devonian, 384 to 394 million years old. About 2 mi of the line.
Granite, tonalite. Age: Silurian, 428 to 445 million years old. About 1 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 Tyngsborough reaches the Atlantic Ocean by way of the Merrimack: about 50 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Tyngsborough; river miles along the main stem, rounded.
Tyngsborough has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 16° in January. About 48 inches of rain fall in a normal year.
On November 14 Tyngsborough normally reaches 51° and falls to 31°. The record high is 70°, in 1959; the record low 12°, in 1905. The most rain on this date, 2.03 in, fell in 1895.
Normals 1991–2020 and records since 1885 at Lowell, 4 miles east-southeast. NOAA, through RCC-ACIS.
