The Calistoga 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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22° on Nov. 15, 2000, the coldest reading for this week of the year since 1906. Next is 24° in 1985.
Calistoga’s center stands about 370 ft above sea level. Within three miles the land runs from 300 ft to 2,110 ft, a difference of 1,810 ft: steep hill country. The highest named summit within 15 miles is Mount Saint Helena, about 4,310 ft, 7 miles north-northwest.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 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 5×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Rhyolite, dacite. Age: Late Miocene to Late Pliocene, 3 to 7 million years old. About 8 mi of the line.
Dacite. Age: Late Miocene to Late Pliocene, 3 to 7 million years old. About 5 mi of the line.
Melange. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 5 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Serpentinite. Age: Middle Jurassic to Late Jurassic, 145 to 175 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.
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.
A raindrop that lands in Calistoga reaches San Francisco Bay and the Pacific Ocean by way of the Napa: about 50 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Calistoga; river miles along the main stem, rounded.
Calistoga has a hot-summer Mediterranean climate. Summer afternoons average 90° in July; winter nights fall to about 38° in December. About 39 inches of rain fall in a normal year.
On November 14 Calistoga normally reaches 66° and falls to 42°. The record high is 88°, in 2008; the record low 26°, in 1985. The most rain on this date, 2.48 in, fell in 1953.
Normals 1991–2020 and records since 1906 at Calistoga, here. NOAA, through RCC-ACIS.
