The Nashua 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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2° on Nov. 17, 1967, the coldest reading for this week of the year since 1885. Next is 5° in 1933.
Nashua’s center stands about 170 ft above sea level. Within three miles the land runs from 100 ft to 360 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Roby Hill, about 990 ft, 15 miles northwest.
Under the town center the state geologic map shows Two-mica granite of northern and southeastern New Hampshire, from the Early Devonian to Late Devonian, 359 to 422 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 32×. 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, biotite-schist. Age: Ordovician to Silurian, 422 to 487 million years old. About 11 mi of the line.
Schist, granofels. Age: Ordovician to Silurian, 422 to 487 million years old. About 5 mi of the line.
Gneiss, biotite-schist, granofels. Age: Neoproterozoic, 542 to 1,000 million years old. About 4 mi of the line.
Granite. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 2 mi of the line.
Granite. Age: Permian, 252 to 299 million years old. About 2 mi of the line.
Granodiorite. 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.
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 Nashua reaches the Atlantic Ocean by way of the Nashua and the Merrimack: about 60 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Nashua; river miles along the main stem, rounded.
Nashua has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 14° in January. A normal year brings about 53 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Nashua normally reaches 52° and falls to 30°. The record high is 71°, in 1989; the record low 12°, in 1986. The most rain on this date, 1.56 in, fell in 1940.
Normals 1991–2020 and records since 1885 at Nashua 2 NNW, here. NOAA, through RCC-ACIS.
