The Wallace 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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78° on Nov. 15, 1993, the hottest reading for this week of the year since 1858. Next is 74° in 1902.
Wallace’s center stands about 570 ft above sea level. Within three miles the land runs from 350 ft to 830 ft, a difference of 480 ft: hilly country. The highest named summit within 15 miles is Welsh Mountain, about 1,080 ft, 11 miles west.
Under the town center the state geologic map shows Graphitic felsic gneiss, from the Precambrian.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 23×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss. Age: Precambrian. About 7 mi of the line.
Age: Precambrian. About 4 mi of the line.
Quartzite, schist. Age: Cambrian, 487 to 542 million years old. About 4 mi of the line.
Arkose. Age: Triassic, 202 to 252 million years old. About 3 mi of the line.
Gneiss. Age: Precambrian. 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. 4 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 Wallace reaches Delaware Bay and the Atlantic Ocean by way of East Branch Brandywine Creek, Brandywine Creek, the Christina and the Delaware: about 80 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Wallace; river miles along the main stem, rounded.
Wallace has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. About 45 inches of rain fall in a normal year.
On November 14 Wallace normally reaches 54° and falls to 36°. The record high is 74°, in 1955; the record low 16°, in 1986. The most rain on this date, 1.37 in, fell in 1995.
Normals 1991–2020 and records since 1858 from the Reading Area threaded record (Reading 4 SW, 20 miles northwest, 250 ft lower). NOAA, through RCC-ACIS.
