The Clyde 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.
Partly cloudy
Showers likely
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87° on Nov. 15, 2008, the hottest reading for this week of the year since 1950. Next is 82° in 2010.
Clyde’s center stands about 50 ft above sea level. Within three miles the land runs from 0 ft to 590 ft, a difference of 590 ft: hilly country. Open water lies within three miles. The highest named summit within 15 miles is Mount Diablo, about 3,810 ft, 12 miles south-southeast.
The section below crosses 10 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 10×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Coarse-detrital. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Coarse-detrital. Age: Pleistocene, less than 2.6 million years old. About 5 mi of the line.
Greenstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 2 mi of the line.
Sandstone, mudstone. Age: Jurassic to Cretaceous, 66 to 202 million years old. About 1 mi of the line.
Siltstone-mudstone. Age: Late Jurassic to Early Cretaceous, 100 to 164 million years old. About 1 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 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. 4 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 Clyde reaches San Francisco Bay and the Pacific Ocean by way of Mount Diablo Creek and Hastings Slough: about 4 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Clyde; river miles along the main stem, rounded.
Clyde has a hot-summer Mediterranean climate. Summer afternoons average 90° in July; winter nights fall to about 40° in January. About 24 inches of rain fall in a normal year.
On November 14 Clyde normally reaches 66° and falls to 46°. The record high is 79°, in 2008; the record low 22°, in 1985. The most rain on this date, 2.15 in, fell in 1972.
Normals 1991–2020 and records since 1950 at Fairfield, 17 miles north. NOAA, through RCC-ACIS.
