The Durham 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° on Nov. 17, 1967, the coldest reading for this week of the year since 1893. Next is 6° in 1933.
Durham’s center stands about 60 ft above sea level. Within three miles the land runs from 10 ft to 250 ft, a difference of 240 ft: rolling country. The highest named summit within 15 miles is Saddleback Mountain, about 1,160 ft, 14 miles west-northwest.
Under the town center the state geologic map shows Exeter Diorite (diorite, gabbro), from the Early Devonian, 394 to 422 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 32×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granofels, biotite-schist. Age: Ordovician to Silurian, 422 to 487 million years old. About 5 mi of the line.
Granite. Age: Late Devonian, 359 to 384 million years old. About 4 mi of the line.
Phyllite, quartzite, mica-schist. Age: Ordovician to Silurian, 422 to 487 million years old. About 4 mi of the line.
Diorite, gabbro. Age: Early Devonian, 394 to 422 million years old. About 4 mi of the line.
Metasandstone, phyllite. Age: Ordovician to Silurian, 422 to 487 million years old. About 3 mi of the line.
Metasandstone, phyllite. Age: Neoproterozoic to Silurian, 422 to 1,000 million years old. About 0.4 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 Durham reaches the Atlantic Ocean by way of Hamel Brook, the Oyster and the Piscataqua: about 12 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Durham; river miles along the main stem, rounded.
Durham has a warm-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 15° in January. A normal year brings about 39 inches of snow; with the rain, that comes to about 45 inches of water.
On November 14 Durham normally reaches 49° and falls to 31°. The record high is 71°, in 1989; the record low 6°, in 2019. The most rain on this date, 2.14 in, fell in 1937.
Normals 1991–2020 and records since 1893 at Durham, here. NOAA, through RCC-ACIS.
