The Holbrook 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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3.71 inches of rain fell in two days, the most for this week of the year since records began in 1893. The next wettest, 3.41 inches, fell in 1947.
Holbrook’s center stands about 210 ft above sea level. Within three miles the land runs from 100 ft to 280 ft, a difference of 180 ft: gently rolling country. The highest named summit within 15 miles is Great Blue Hill, about 630 ft, 7 miles northwest.
Under the town center the state geologic map shows Dedham Granite, from the Neoproterozoic, 615 to 645 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. 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. Age: Neoproterozoic, 615 to 645 million years old. About 16 mi of the line.
Age: Neoproterozoic, 542 to 1,000 million years old. About 5 mi of the line.
Sandstone, graywacke. Age: Carboniferous, 299 to 324 million years old. About 0.7 mi of the line.
Conglomerate, sandstone, siltstone. Age: Neoproterozoic to Early Cambrian, 521 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.
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 Holbrook reaches Boston Harbor and the Atlantic Ocean by way of the Cochato and the Monatiquot: about 15 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Holbrook; river miles along the main stem, rounded.
Holbrook has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 18° in January. A normal year brings about 70 inches of snow; with the rain, that comes to about 54 inches of water.
On November 14 Holbrook normally reaches 51° and falls to 34°. The record high is 68°, in 1956; the record low 11°, in 1905. The most rain on this date, 2.08 in, fell in 2009.
Normals 1991–2020 and records since 1893 from the Milton Area threaded record (Blue Hill Lcd, 7 miles northwest, 420 ft higher). NOAA, through RCC-ACIS.
