The Caln 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
Sunny
Sunny
Mostly sunny
Mostly sunny
16° on Nov. 11, 2017, the coldest reading for this week of the year since 1992. Next is 19° in 1996.
Caln’s center stands about 400 ft above sea level. Within three miles the land runs from 280 ft to 640 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Welsh Mountain, about 1,080 ft, 12 miles northwest.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 24×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Muscovite-gneiss. Age: Precambrian. About 8 mi of the line.
Mica-schist. Age: Paleozoic, 252 to 542 million years old. About 5 mi of the line.
Schist, phyllite. Age: Paleozoic, 252 to 542 million years old. About 3 mi of the line.
Gneiss. Age: Precambrian. About 2 mi of the line.
Quartzite, schist. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Gneiss. Age: Precambrian. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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 Caln reaches Delaware Bay and the Atlantic Ocean by way of Beaver Creek, East Branch Brandywine Creek, Brandywine Creek, the Christina and the Delaware: about 75 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Caln; river miles along the main stem, rounded.
Caln has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 24° in January. A normal year brings about 34 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Caln normally reaches 54° and falls to 37°. The record high is 70°, in 1993; the record low 25°, in 2004. The most rain on this date, 0.50 in, fell in 2008.
Normals 1991–2020 and records since 1992 at New Holland 2 SE, 16 miles west-northwest, 200 ft higher. NOAA, through RCC-ACIS.
