The Conewago 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.
Conewago’s center stands about 520 ft above sea level. Within three miles the land runs from 410 ft to 770 ft, a difference of 360 ft: rolling country. The highest named summit within 15 miles is Governor Dick Hill, about 1,190 ft, 9 miles east-northeast.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 28×. 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 10 mi of the line.
Sandstone. Age: Triassic, 202 to 252 million years old. About 5 mi of the line.
Basalt. Age: Jurassic, 145 to 202 million years old. About 4 mi of the line.
Conglomerate. Age: Triassic, 202 to 252 million years old. About 3 mi of the line.
Limestone, dolostone. Age: Cambrian, 487 to 542 million years old. About 1 mi of the line.
Conglomerate, sandstone. Age: Triassic, 202 to 252 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.
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 Conewago reaches Chesapeake Bay and the Atlantic Ocean by way of Conewago Creek and the Susquehanna: about 70 river miles.
Lake on the way: Lake Aldred.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Conewago; river miles along the main stem, rounded.
Conewago 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 Conewago 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, 8 miles west, 220 ft lower). NOAA, through RCC-ACIS.
