The Silverado 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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23° on Nov. 11, 1950, the coldest reading for this week of the year since 1893. Next is 25° in 1958.
Silverado’s center stands about 1,300 ft above sea level. Within three miles the land runs from 920 ft to 3,250 ft, a difference of 2,330 ft: mountain country. The highest named summit within 15 miles is Santiago Peak, about 5,660 ft, 6 miles east-southeast.
Under the town center the state geologic map shows Mesozoic volcanic rocks, unit 4 (Peninsular Ranges) (felsic-volcanic, mafic-volcanic), from the Late Jurassic to Early Cretaceous, 100 to 164 million years old.
The section below crosses 11 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.
Argillite. Age: Paleozoic to Late Jurassic, 145 to 542 million years old. About 7 mi of the line.
Sandstone, conglomerate. Age: Middle Eocene to Early Miocene, 16 to 48 million years old. About 5 mi of the line.
Felsic-volcanic, mafic-volcanic. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 4 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Tonalite. Age: Middle Jurassic to Late Cretaceous, 66 to 175 million years old. About 1 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 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. 5 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 Silverado reaches the Pacific Ocean by way of Silverado Creek, Santiago Creek and the Santa Ana: about 30 river miles.
Often dry. About 90% of the way is mapped as streams that run only after rain or snowmelt; the water makes the whole trip in floods.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Silverado; river miles along the main stem, rounded.
Silverado has a hot semi-arid climate. Summer afternoons average 95° in August; winter nights fall to about 43° in December. About 9 inches of rain fall in a normal year.
On November 14 Silverado normally reaches 75° and falls to 48°. The record high is 95°, in 1906; the record low 27°, in 1915. The most rain on this date, 0.54 in, fell in 1972.
Normals 1991–2020 and records since 1893 from the Riverside Area threaded record (Riverside Municipal Airport, 18 miles northeast, 460 ft lower). NOAA, through RCC-ACIS.
