The Arlington 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.
Partly cloudy
Mostly sunny
Partly cloudy
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
78° on Nov. 15, 1993, the hottest reading for this week of the year since 1872. Next is 76° in 1909.
Arlington’s center stands about 80 ft above sea level. Within three miles the land runs from 0 ft to 340 ft, a difference of 340 ft: rolling country. The highest named summit within 15 miles is Great Blue Hill, about 630 ft, 14 miles south.
Under the town center the state geologic map shows Metamorphosed mafic to felsic flow, and volcaniclastic and hypabyssal intrusive rocks (metavolcanic), from the Neoproterozoic, 542 to 1,000 million years old.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Argillite. Age: Neoproterozoic to Early Cambrian, 521 to 1,000 million years old. About 7 mi of the line.
Diorite, gabbro. Age: Neoproterozoic, 542 to 1,000 million years old. About 6 mi of the line.
Granite, pegmatite. Age: Ordovician to Silurian, 422 to 487 million years old. About 3 mi of the line.
Diorite, quartz-diorite. Age: Silurian, 428 to 445 million years old. About 1 mi of the line.
Gneiss. Age: Neoproterozoic to Ordovician, 445 to 1,000 million years old. About 1 mi of the line.
Gneiss. Age: Early Cambrian to Early Ordovician, 478 to 523 million years old. About 0.6 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 4 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 Arlington reaches Boston Harbor and the Atlantic Ocean by way of the Mystic: about 7 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Arlington; river miles along the main stem, rounded.
Arlington 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 Arlington 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, 9 miles east-southeast). NOAA, through RCC-ACIS.
