The Dedham 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.
Mostly sunny
Partly cloudy; warmer
Mostly sunny
Mostly sunny
Partly cloudy
Mostly sunny
Showers likely
−10° on Nov. 14, 1959, the coldest reading for this week of the year since 1893. Next is −8° in 1986.
Dedham’s center stands about 1,270 ft above sea level. Within three miles the land runs from 1,200 ft to 1,440 ft, a difference of 240 ft: rolling country.
Under the town center the state geologic map shows Dakata and Windrow Formations (sandstone, shale), from the Early Cretaceous to Late Cretaceous, 94 to 113 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 49×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Early Cretaceous to Late Cretaceous, 94 to 113 million years old. About 19 mi of the line.
Shale, sandstone, siltstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 3 mi of the line.
Shale, limestone. Age: Middle Pennsylvanian, 307 to 315 million years old. About 3 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 Dedham reaches the Gulf of America by way of Dedham Creek, Brushy Creek, the South Raccoon, the North Raccoon, the Des Moines and the Mississippi: about 1,630 river miles.
Lake on the way: Roberts Creek.
1,330 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Dedham; river miles along the main stem, rounded.
Dedham has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 10° in January. About 34 inches of rain fall in a normal year.
On November 14 Dedham normally reaches 47° and falls to 27°. The record high is 71°, in 1990; the record low −10°, in 1959. The most rain on this date, 1.87 in, fell in 1926.
Normals 1991–2020 and records since 1893 at Carroll, 11 miles north. NOAA, through RCC-ACIS.
