The Sereno del Mar 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.
Partly cloudy
Showers likely
Chance of showers
Showers likely
Showers likely
Showers likely
Partly cloudy
22° on Nov. 17, 1961, the coldest reading for this week of the year since 1926. Next is 22° in 1978.
Sereno del Mar’s center stands about 200 ft above sea level. Within three miles the land runs from 10 ft to 1,120 ft, a difference of 1,110 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Pole Mountain, about 2,150 ft, 9 miles north-northwest.
Under the town center the state geologic map shows Franciscan melange, from the Jurassic to Cretaceous, 66 to 202 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 11×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 6 mi of the line.
Sandstone, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 4 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 1 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous, 113 to 145 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit 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.
Rain that falls on Sereno del Mar runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Sereno del Mar; river miles along the main stem, rounded.
Sereno del Mar has a warm-summer Mediterranean climate. Summer afternoons average 84° in August; winter nights fall to about 37° in January. About 40 inches of rain fall in a normal year.
On November 14 Sereno del Mar normally reaches 67° and falls to 40°. The record high is 85°, in 2008; the record low 25°, in 1985. The most rain on this date, 2.44 in, fell in 1972.
Normals 1991–2020 and records since 1926 at Graton, 12 miles east-northeast. NOAA, through RCC-ACIS.
