The Philo 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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88° on Nov. 17, 1932, the hottest reading for this week of the year since 1893. Next is 85° in 1930.
Philo’s center stands about 350 ft above sea level. Within three miles the land runs from 170 ft to 1,820 ft, a difference of 1,650 ft: steep hill country. The highest named summit within 15 miles is Sanel Mountain, about 3,340 ft, 15 miles east-southeast.
Under the town center the state geologic map shows Older Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene, less than 2.6 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 7×. 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, mudstone. Age: Late Cretaceous to Pliocene, 2.6 to 100 million years old. About 23 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 Philo reaches the Pacific Ocean by way of Indian Creek and the Navarro: about 30 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Philo; river miles along the main stem, rounded.
Philo has a hot-summer Mediterranean climate. Summer afternoons average 94° in July; winter nights fall to about 36° in December. About 35 inches of rain fall in a normal year.
On November 14 Philo normally reaches 65° and falls to 40°. The record high is 79°, in 2008; the record low 20°, in 1916. The most rain on this date, 1.91 in, fell in 1903.
Normals 1991–2020 and records since 1893 from the Ukiah Area threaded record (Ukiah Municipal Airport, 14 miles east-northeast, 250 ft higher). NOAA, through RCC-ACIS.
