The Clearlake Oaks 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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82° on Nov. 12, 2014, the hottest reading for this week of the year since 1954. Next is 81° in 1995.
Clearlake Oaks’s center stands about 1,360 ft above sea level. Within three miles the land runs from 1,320 ft to 2,380 ft, a difference of 1,060 ft: steep hill country. The highest named summit within 15 miles is Bartlett Mountain, about 4,760 ft, 13 miles north-northwest.
Under the town center the state geologic map shows Franciscan Complex, unit 1 (Coast Ranges) (sandstone, mudstone), from the Jurassic to Cretaceous, 66 to 202 million years old.
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 7×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 12 mi of the line.
Andesite. Age: Early Pliocene to Pleistocene, 1.5 to 4 million years old. About 7 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Andesite. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.8 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.6 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 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 Clearlake Oaks reaches San Francisco Bay and the Pacific Ocean by way of Clear Lake, Cache Creek, Prospect Slough, Cache Slough and the Sacramento: about 150 river miles.
Lake on the way: Clear Lake.
120 miles of the trip are on Cache Creek.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clearlake Oaks; river miles along the main stem, rounded.
Clearlake Oaks has a hot-summer Mediterranean climate. Summer afternoons average 91° in July; winter nights fall to about 32° in December. About 30 inches of rain fall in a normal year.
On November 14 Clearlake Oaks normally reaches 64° and falls to 36°. The record high is 81°, in 1995; the record low 23°, in 1978. The most rain on this date, 3.07 in, fell in 1965.
Normals 1991–2020 and records since 1954 at Clearlake 4 SE, 9 miles southeast. NOAA, through RCC-ACIS.
