The Keswick 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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88° on Nov. 13, 1995, the hottest reading for this week of the year since 1893. Next is 87° in 1933.
Keswick’s center stands about 760 ft above sea level. Within three miles the land runs from 540 ft to 2,050 ft, a difference of 1,510 ft: steep hill country. The highest named summit within 15 miles is Shasta Bally, about 6,170 ft, 10 miles west.
Under the town center the state geologic map shows Mesozoic granitic rocks, unit 4 (Klamath Mountains and Northern Sierra Nevada) (granodiorite, trondhjemite), from the Early Devonian to Late Devonian, 364 to 400 million years old.
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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Mafic-volcanic. Age: Permian, 252 to 299 million years old. About 8 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 5 mi of the line.
Granodiorite, trondhjemite. Age: Early Devonian to Late Devonian, 364 to 400 million years old. About 5 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 1 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 1 mi of the line.
Siltstone-mudstone, mudstone. Age: Middle Triassic to Late Triassic, 202 to 247 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. 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 Keswick reaches San Francisco Bay and the Pacific Ocean by way of Rock Creek and the Sacramento: about 300 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Keswick; river miles along the main stem, rounded.
Keswick has a hot-summer Mediterranean climate. Summer afternoons average 100° in July; winter nights fall to about 37° in December. About 34 inches of rain fall in a normal year, with about 3 inches of snow.
On November 14 Keswick normally reaches 65° and falls to 42°. The record high is 87°, in 1933; the record low 23°, in 1985. The most rain on this date, 2.32 in, fell in 1934.
Normals 1991–2020 and records since 1893 from the Redding Area threaded record (Redding Airport, 12 miles southeast, 260 ft lower). NOAA, through RCC-ACIS.
