The Jamestown 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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72° on Nov. 12, 2022, the hottest reading for this week of the year since 1996. Next is 67° in 2005.
Jamestown’s center stands about 14 ft above sea level. Within three miles the land runs from 0 ft to 130 ft, a difference of 130 ft: gently rolling country. Open water lies within three miles. The highest named summit within 15 miles is Pine Hill, about 590 ft, 14 miles west-northwest.
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 57×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Age: Carboniferous, 299 to 324 million years old. About 6 mi of the line.
Alkali-feldspar-granite. Age: Late Devonian, 366 to 380 million years old. About 2 mi of the line.
Siltstone, phyllite. Age: Paleozoic, 252 to 542 million years old. About 1 mi of the line.
Siltstone, sandstone. Age: Neoproterozoic, 542 to 1,000 million years old. About 1 mi of the line.
Granite. Age: Late Devonian, 366 to 380 million years old. About 0.5 mi of the line.
Sedimentary. Age: Neoproterozoic, 542 to 1,000 million years old. About 0.5 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.
Rain that falls on Jamestown runs straight into Narragansett Bay and the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jamestown; river miles along the main stem, rounded.
Jamestown has a hot-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 24° in January. About 42 inches of rain fall in a normal year.
On November 14 Jamestown normally reaches 53° and falls to 38°. The record high is 67°, in 2005; the record low 20°, in 2019. The most rain on this date, 0.64 in, fell in 2000.
Normals 1991–2020 and records since 1996 at Newport State Airport, 5 miles east-northeast, 130 ft higher. NOAA, through RCC-ACIS.
