The Weaverville 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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78° on Nov. 11, 2019, the hottest reading for this week of the year since 1974. Next is 72° in 1995.
Weaverville’s center stands about 2,050 ft above sea level. Within three miles the land runs from 1,910 ft to 3,800 ft, a difference of 1,890 ft: steep hill country. The highest named summit within 15 miles is Granite Peak, about 8,010 ft, 13 miles north-northeast.
Under the town center the state geologic map shows Oligocene nonmarine rocks, unit 1 (Northern California) (sandstone), from the Oligocene to Miocene, 5.3 to 34 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Amphibolite, schist. Age: Devonian, 359 to 422 million years old. About 18 mi of the line.
Sandstone. Age: Oligocene to Miocene, 5.3 to 34 million years old. About 4 mi of the line.
Diorite. Age: Jurassic to Early Cretaceous, 100 to 202 million years old. About 2 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 0.3 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 Weaverville reaches the Pacific Ocean by way of Weaver Creek, the Trinity and the Klamath: about 150 river miles.
95 miles of the trip are on the Trinity.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Weaverville; river miles along the main stem, rounded.
Weaverville has a hot-summer Mediterranean climate. Summer afternoons average 96° in July; winter nights fall to about 32° in December. A normal year brings about 6 inches of snow; with the rain, that comes to about 32 inches of water.
On November 14 Weaverville normally reaches 59° and falls to 36°. The record high is 72°, in 2013; the record low 21°, in 1985. The most rain on this date, 1.04 in, fell in 1981.
Normals 1991–2020 and records since 1974 at Trinity River Hatchery, 8 miles east, 190 ft lower. NOAA, through RCC-ACIS.
