The Johnsonburg 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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75° on Nov. 16, 1993, the hottest reading for this week of the year since 1893. Next is 74° in 1902.
Johnsonburg’s center stands about 580 ft above sea level. Within three miles the land runs from 450 ft to 850 ft, a difference of 400 ft: hilly country. The highest named summit within 15 miles is Mount Tammany, about 1,530 ft, 13 miles west.
The section below crosses 15 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.
Graywacke, siltstone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 5 mi of the line.
Dolostone. Age: Cambrian to Early Ordovician, 471 to 497 million years old. About 5 mi of the line.
Granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Siltstone, sandstone. Age: Silurian, 422 to 428 million years old. About 2 mi of the line.
Syenite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 1 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million 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. 9 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 Johnsonburg reaches Delaware Bay and the Atlantic Ocean by way of the Pequest and the Delaware: about 190 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Johnsonburg; river miles along the main stem, rounded.
Johnsonburg has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 18° in January. A normal year brings about 23 inches of snow; with the rain, that comes to about 48 inches of water.
On November 14 Johnsonburg normally reaches 53° and falls to 30°. The record high is 72°, in 1964; the record low 11°, in 1905. The most rain on this date, 0.90 in, fell in 1940.
Normals 1991–2020 and records since 1893 from the Belvidere Area threaded record (Belvidere Bridge, 14 miles southwest, 320 ft lower). NOAA, through RCC-ACIS.
