The Fair Oaks 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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26° on Nov. 14, 2018, the coldest reading for this week of the year since 1950. Next is 27° in 1993.
Fair Oaks’s center stands about 620 ft above sea level. Within three miles the land runs from 460 ft to 1,530 ft, a difference of 1,070 ft: steep hill country. The highest named summit within 15 miles is Middle Mountain, about 4,440 ft, 15 miles east-northeast.
Under the town center the state geologic map shows Marine sandstone, siltstone, and mudstone, from the Paleocene to Early Eocene, 48 to 66 million years old.
The section below crosses 8 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.
Sandstone. Age: Paleocene to Early Eocene, 48 to 66 million years old. About 13 mi of the line.
Basalt. Age: Paleocene to Middle Eocene, 38 to 66 million years old. About 3 mi of the line.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 3 mi of the line.
Sand, gravel, silt. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Sandstone, siltstone. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 2 mi of the line.
Sandstone. Age: Middle Eocene, 38 to 48 million years old. About 0.7 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 2 smaller units 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 Fair Oaks reaches the Pacific Ocean by way of Calapooya Creek and the Umpqua: about 120 river miles.
100 miles of the trip are on the Umpqua.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Fair Oaks; river miles along the main stem, rounded.
Fair Oaks has a warm-summer Mediterranean climate. Summer afternoons average 86° in July; winter nights fall to about 35° in January. About 36 inches of rain fall in a normal year.
On November 14 Fair Oaks normally reaches 56° and falls to 39°. The record high is 75°, in 1999; the record low 26°, in 2018. The most rain on this date, 1.83 in, fell in 2024.
Normals 1991–2020 and records since 1950 at Winchester, 12 miles southwest, 170 ft lower. NOAA, through RCC-ACIS.
