The Jefferson 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; warmer
Partly cloudy
Mostly sunny
Sunny
Mostly sunny
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76° on Nov. 16, 1993, the hottest reading for this week of the year since 1893. Next is 74° in 1927.
Jefferson’s center stands about 1,250 ft above sea level. Within three miles the land runs from 760 ft to 1,380 ft, a difference of 620 ft: hilly country. The highest named summit within 15 miles is Bearfort Mountain, about 1,480 ft, 13 miles northeast.
The section below crosses 20 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 16×. 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: Mesoproterozoic, 1.1 to 1.1 billion years old. About 4 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 3 mi of the line.
Dolostone. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 2 mi of the line.
Granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 2 mi of the line.
Conglomerate. Age: Silurian, 428 to 445 million years old. About 1 mi of the line.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 14 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 Jefferson reaches Delaware Bay and the Atlantic Ocean by way of Beaver Brook, the Musconetcong and the Delaware: about 200 river miles.
140 miles of the trip are on the Delaware.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jefferson; river miles along the main stem, rounded.
Jefferson has a hot-summer humid continental climate. Summer afternoons average 83° in July; winter nights fall to about 19° in January. About 52 inches of rain fall in a normal year.
On November 14 Jefferson normally reaches 52° and falls to 32°. The record high is 71°, in 1902; the record low 10°, in 1905. The most rain on this date, 1.37 in, fell in 1935.
Normals 1991–2020 and records since 1893 at Charlotteburg Reservoir, 7 miles east-northeast, 470 ft lower. NOAA, through RCC-ACIS.
