The Graceham 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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77° on Nov. 15, 1973, the hottest reading for this week of the year since 1956. Next is 76° in 2020.
Graceham’s center stands about 520 ft above sea level. Within three miles the land runs from 340 ft to 1,230 ft, a difference of 890 ft: hilly country. The highest named summit within 15 miles is Quirauk Mountain, about 2,150 ft, 9 miles northwest.
Under the town center the state geologic map shows Gettysburg Shale (shale, sandstone), 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 12×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, shale. Age: Triassic, 202 to 252 million years old. About 6 mi of the line.
Shale, sandstone. Age: Triassic, 202 to 252 million years old. About 4 mi of the line.
Metabasalt. Age: Proterozoic to Mesoproterozoic, 1 to 2.5 billion years old. About 4 mi of the line.
Dolostone. Age: Cambrian, 487 to 542 million years old. About 2 mi of the line.
Quartzite. Age: Proterozoic to Cambrian, 487 to 2,500 million years old. About 2 mi of the line.
Metarhyolite. Age: Proterozoic, 542 to 2,500 million years old. 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. 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 Graceham reaches Chesapeake Bay and the Atlantic Ocean by way of Big Hunting Creek, the Monocacy and the Potomac: about 200 river miles.
160 miles of the trip are on the Potomac.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Graceham; river miles along the main stem, rounded.
Graceham has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 22° in January. A normal year brings about 28 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Graceham normally reaches 55° and falls to 34°. The record high is 72°, in 1989; the record low 15°, in 1986. The most rain on this date, 2.25 in, fell in 1972.
Normals 1991–2020 and records since 1956 at Emmitsburg 2 SE, 7 miles northeast, 120 ft lower. NOAA, through RCC-ACIS.
