The Hudson 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 1948. Next is 75° in 1993.
Hudson’s center stands about 180 ft above sea level. Within three miles the land runs from 100 ft to 460 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Birch Hill, about 850 ft, 11 miles west.
Under the town center the state geologic map shows Merrimack Group, Berwick Formation (granofels, biotite-schist), 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 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 13 mi of the line.
Schist, granofels. Age: Ordovician to Silurian, 422 to 487 million years old. About 4 mi of the line.
Gneiss, biotite-schist, granofels. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 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. 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 Hudson reaches the Atlantic Ocean by way of First Brook and the Merrimack: about 55 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hudson; river miles along the main stem, rounded.
Hudson has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 13° in January. A normal year brings about 67 inches of snow; with the rain, that comes to about 46 inches of water.
On November 14 Hudson normally reaches 50° and falls to 29°. The record high is 64°, in 2010; the record low 8°, in 1986. The most rain on this date, 0.77 in, fell in 2018.
Normals 1991–2020 and records since 1948 at Hudson 1 SSE, here. NOAA, through RCC-ACIS.
