The Rockingham 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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68° on Nov. 11, 2002, the hottest reading for this week of the year since 1996. Next is 68° in 2022.
Rockingham’s center stands about 510 ft above sea level. Within three miles the land runs from 280 ft to 1,400 ft, a difference of 1,120 ft: steep hill country. The highest named summit within 15 miles is Glebe Mountain, about 2,960 ft, 14 miles west.
The section below crosses 17 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. 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, quartzite. Age: Cambrian to Early Ordovician, 471 to 542 million years old. About 4 mi of the line.
Phyllite, limestone. Age: Silurian to Early Devonian, 394 to 425 million years old. About 3 mi of the line.
Muscovite-schist, metagraywacke. Age: Silurian to Early Devonian, 394 to 425 million years old. About 3 mi of the line.
Metagraywacke. Age: Early Devonian, 410 to 414 million years old. About 3 mi of the line.
Paragneiss. Age: Neoproterozoic, 938 to 960 million years old. About 2 mi of the line.
Slate, schist. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 11 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 Rockingham reaches Long Island Sound and the Atlantic Ocean by way of the Williams and the Connecticut: about 180 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Rockingham; river miles along the main stem, rounded.
Rockingham has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 11° in January. About 40 inches of rain fall in a normal year.
On November 14 Rockingham normally reaches 47° and falls to 28°. The record high is 62°, in 2016; the record low 11°, in 2019. The most rain on this date, 1.12 in, fell in 2009.
Normals 1991–2020 and records since 1996 at Springfield Hartness State Airport, 11 miles north. NOAA, through RCC-ACIS.
