The Mount Royal 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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76° on Nov. 15, 1973, the hottest reading for this week of the year since 1888. Next is 76° in 1993.
Mount Royal’s center stands about 450 ft above sea level. Within three miles the land runs from 350 ft to 1,000 ft, a difference of 650 ft: hilly country. The highest named summit within 15 miles is Long Mountain, about 1,570 ft, 13 miles west-northwest.
Under the town center the state geologic map shows Gettysburg Formation (siltstone-mudstone, shale), from the Triassic, 202 to 252 million years old.
The section below crosses 12 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 20×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Siltstone-mudstone, shale. Age: Triassic, 202 to 252 million years old. About 9 mi of the line.
Arkose. Age: Triassic, 202 to 252 million years old. About 5 mi of the line.
Basalt. Age: Jurassic, 145 to 202 million years old. About 2 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 1 mi of the line.
Conglomerate. Age: Triassic, 202 to 252 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. 6 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 Mount Royal reaches Chesapeake Bay and the Atlantic Ocean by way of Conewago Creek and the Susquehanna: about 80 river miles.
Lake on the way: Lake Aldred.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Royal; river miles along the main stem, rounded.
Mount Royal has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 23° in January. A normal year brings about 30 inches of snow; with the rain, that comes to about 44 inches of water.
On November 14 Mount Royal normally reaches 54° and falls to 36°. The record high is 74°, in 1989; the record low 19°, in 1986. The most rain on this date, 1.74 in, fell in 1995.
Normals 1991–2020 and records since 1888 from the Middletown-Harrisburg Area threaded record (Middletown Harrisburg Int'L Airport, 12 miles north-northeast, 150 ft lower). NOAA, through RCC-ACIS.
