The Deer Park 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.
Mostly sunny
Showers likely
Showers likely
Showers likely
Showers likely
Showers likely
Partly cloudy
22° on Nov. 15, 2000, the coldest reading for this week of the year since 1906. Next is 24° in 1985.
Deer Park’s center stands about 620 ft above sea level. Within three miles the land runs from 200 ft to 1,760 ft, a difference of 1,560 ft: steep hill country. The highest named summit within 15 miles is Mount Saint Helena, about 4,310 ft, 13 miles northwest.
Under the town center the state geologic map shows Tertiary pyroclastic and volcanic mudflow deposits, unit 1 (Sonoma Volcanic Field) (rhyolite, dacite), from the Late Miocene to Late Pliocene, 3 to 7 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Dacite. Age: Late Miocene to Late Pliocene, 3 to 7 million years old. About 12 mi of the line.
Rhyolite, dacite. Age: Late Miocene to Late Pliocene, 3 to 7 million years old. About 5 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 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.
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 Deer Park reaches San Francisco Bay and the Pacific Ocean by way of Ca¿on Creek and the Napa: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Deer Park; river miles along the main stem, rounded.
Deer Park 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 Deer Park 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, 7 miles west-northwest, 270 ft lower. NOAA, through RCC-ACIS.
