The Hollis 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.
Hollis’s center stands about 410 ft above sea level. Within three miles the land runs from 180 ft to 630 ft, a difference of 450 ft: hilly country. The highest named summit within 15 miles is Blood Hill, about 1,520 ft, 14 miles west-southwest.
Under the town center the state geologic map shows Merrimack Group, Berwick Formation, Unnamed member (schist, granofels), from the Ordovician to Silurian, 422 to 487 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 17×. 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 9 mi of the line.
Granite. Age: Permian, 252 to 299 million years old. About 5 mi of the line.
Schist, granofels. Age: Ordovician to Silurian, 422 to 487 million years old. About 4 mi of the line.
Quartz-diorite, tonalite, granodiorite. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Granite. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 1 mi of the line.
Gneiss, biotite-schist, granofels. Age: Neoproterozoic, 542 to 1,000 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. 1 smaller unit 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 Hollis reaches the Atlantic Ocean by way of the Nashua and the Merrimack: about 65 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 Hollis; river miles along the main stem, rounded.
Hollis 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 Hollis 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, 7 miles east-northeast, 280 ft lower. NOAA, through RCC-ACIS.
