The New Hampshire 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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77° on Nov. 11, 2020, the hottest reading for this week of the year since 1901. Next is 73° in 1958.
New Hampshire’s center stands about 1,030 ft above sea level. Within three miles the land runs from 1,010 ft to 1,060 ft, a difference of 50 ft: nearly flat ground.
Under the town center the state geologic map shows Salina Group (dolostone), from the Silurian, 422 to 445 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dolostone. Age: Silurian, 428 to 445 million years old. About 12 mi of the line.
Dolostone. Age: Silurian, 422 to 445 million years old. About 10 mi of the line.
Dolostone. Age: Silurian, 425 to 445 million years old. About 3 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 New Hampshire reaches the Gulf of America by way of Muchinippi Creek, the Great Miami, the Ohio and the Mississippi: about 1,620 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of New Hampshire; river miles along the main stem, rounded.
New Hampshire has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 19° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 41 inches of water.
On November 14 New Hampshire normally reaches 51° and falls to 34°. The record high is 72°, in 1909; the record low 9°, in 2019. The most rain on this date, 2.10 in, fell in 1993.
Normals 1991–2020 and records since 1901 at Lima Wwtp, 15 miles northwest, 180 ft lower. NOAA, through RCC-ACIS.
