The Quincy 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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78° on Nov. 15, 1993, the hottest reading for this week of the year since 1872. Next is 76° in 1909.
Quincy’s center stands about 40 ft above sea level. Within three miles the land runs from 0 ft to 270 ft, a difference of 270 ft: rolling country. Open water lies within three miles. The highest named summit within 15 miles is Great Blue Hill, about 630 ft, 6 miles west-southwest.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 46×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Alkali-granite. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 3 mi of the line.
Rhyolite. Age: Neoproterozoic, 599 to 605 million years old. About 3 mi of the line.
Granite. Age: Late Ordovician to Silurian, 428 to 459 million years old. About 3 mi of the line.
Argillite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 2 mi of the line.
Argillite. Age: Early Cambrian to Middle Cambrian, 497 to 542 million years old. About 2 mi of the line.
Granite. Age: Neoproterozoic, 615 to 645 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. 2 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.
Rain that falls on Quincy runs straight into Boston Harbor and the Atlantic Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Quincy; river miles along the main stem, rounded.
Quincy has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 23° in January. A normal year brings about 49 inches of snow; with the rain, that comes to about 44 inches of water.
On November 14 Quincy normally reaches 52° and falls to 38°. The record high is 71°, in 1993; the record low 16°, in 1905. The most rain on this date, 1.49 in, fell in 2009.
Normals 1991–2020 and records since 1872 from the Boston Area threaded record (Boston Logan International Airport, 7 miles north). NOAA, through RCC-ACIS.
