The Jenner 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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27° on Nov. 12, 1985, the coldest reading for this week of the year since 1895. Next is 29° in 1987.
Jenner’s center stands about 50 ft above sea level. Within three miles the land runs from 0 ft to 1,420 ft, a difference of 1,420 ft: steep hill country. Open water lies within three miles. The highest named summit within 15 miles is Pole Mountain, about 2,150 ft, 4 miles north.
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 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. 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 5 mi of the line.
Sandstone, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 3 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 3 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 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 0.6 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 0.6 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.
Rain that falls on Jenner runs straight into the Pacific Ocean.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Jenner; river miles along the main stem, rounded.
Jenner has a warm-summer Mediterranean climate. Summer afternoons average 67° in August; winter nights fall to about 42° in January. About 39 inches of rain fall in a normal year.
On November 14 Jenner normally reaches 61° and falls to 44°. The record high is 73°, in 1990; the record low 30°, in 1985. The most rain on this date, 2.10 in, fell in 1972.
Normals 1991–2020 and records since 1895 at Fort Ross, 8 miles west-northwest. NOAA, through RCC-ACIS.
