The Lexington 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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76° on Nov. 12, 2022, the hottest reading for this week of the year since 1949. Next is 75° in 2020.
Lexington’s center stands about 230 ft above sea level. Within three miles the land runs from 120 ft to 350 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Nobscot Hill, about 620 ft, 13 miles west-southwest.
Under the town center the state geologic map shows Diorite and gabbro (diorite, gabbro), from the Neoproterozoic, 542 to 1,000 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite, pegmatite. Age: Ordovician to Silurian, 422 to 487 million years old. About 5 mi of the line.
Rhyolite, felsic-volcanic. Age: Neoproterozoic, 593 to 599 million years old. About 5 mi of the line.
Diorite, gabbro. Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Granite, granodiorite. Age: Neoproterozoic, 615 to 645 million years old. About 2 mi of the line.
Metavolcanic. Age: Neoproterozoic, 542 to 1,000 million years old. About 2 mi of the line.
Diorite, quartz-diorite. Age: Silurian, 428 to 445 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. 6 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 Lexington reaches Boston Harbor and the Atlantic Ocean by way of Shaker Glen Brook, Fowle Brook, the Malden, Horn Pond Brook and the Mystic: about 16 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lexington; river miles along the main stem, rounded.
Lexington has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 18° in January. About 43 inches of rain fall in a normal year.
On November 14 Lexington normally reaches 53° and falls to 33°. The record high is 70°, in 1959; the record low 14°, in 2019. The most rain on this date, 3.12 in, fell in 2009.
Normals 1991–2020 and records since 1949 at Bedford Hanscom Field, 4 miles west-northwest, 100 ft lower. NOAA, through RCC-ACIS.
