The Castle Hill 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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67° on Nov. 11, 2020, the hottest reading for this week of the year since 1939. Next is 66° in 2002.
Castle Hill’s center stands about 860 ft above sea level. Within three miles the land runs from 510 ft to 1,090 ft, a difference of 580 ft: hilly country. The highest named summit within 15 miles is Scopan Mountain, about 1,470 ft, 6 miles south-southeast.
The section below crosses 8 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.
Basalt. Age: Ordovician, 445 to 487 million years old. About 6 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Early Devonian, 394 to 422 million years old. About 5 mi of the line.
Mudstone. Age: Silurian, 422 to 445 million years old. About 5 mi of the line.
Mudstone, sandstone. Age: Silurian, 422 to 445 million years old. About 3 mi of the line.
Mudstone, sandstone. Age: Devonian, 359 to 422 million years old. About 3 mi of the line.
Sandstone, conglomerate. Age: Silurian, 422 to 445 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. 2 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 Castle Hill reaches the Bay of Fundy and the Atlantic Ocean by way of the North Branch Presque Isle Stream, the Presque Isle Stream, the Aroostook and the Saint John: about 240 river miles.
190 miles of the trip are on the Saint John.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Castle Hill; river miles along the main stem, rounded.
Castle Hill has a warm-summer humid continental climate. Summer afternoons average 77° in July; winter nights fall to about 3° in January. A normal year brings about 118 inches of snow; with the rain, that comes to about 41 inches of water.
On November 14 Castle Hill normally reaches 40° and falls to 26°. The record high is 60°, in 1951; the record low 3°, in 2019. The most rain on this date, 2.22 in, fell in 2006.
Normals 1991–2020 and records since 1939 from the Caribou Area threaded record (Caribou Wfo, 15 miles northeast, 240 ft lower). NOAA, through RCC-ACIS.
