The San Anselmo 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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6.85 inches of rain fell in two days, the most for this week of the year since records began in 1902. The next wettest, 6.57 inches, fell in 1942.
San Anselmo’s center stands about 60 ft above sea level. Within three miles the land runs from 0 ft to 1,320 ft, a difference of 1,320 ft: steep hill country. The highest named summit within 15 miles is Mount Tamalpais, about 2,570 ft, 4 miles south-southwest.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. 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 9 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 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 San Anselmo reaches San Francisco Bay and the Pacific Ocean by way of Sleepy Hollow Creek, San Anselmo Creek and Corte Madera Creek: about 6 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of San Anselmo; river miles along the main stem, rounded.
San Anselmo has a warm-summer Mediterranean climate. Summer afternoons average 83° in July; winter nights fall to about 42° in January. About 44 inches of rain fall in a normal year.
On November 14 San Anselmo normally reaches 64° and falls to 46°. The record high is 81°, in 2010; the record low 25°, in 1916. The most rain on this date, 3.10 in, fell in 1952.
Normals 1991–2020 and records since 1902 at Kentfield, here. NOAA, through RCC-ACIS.
