The Allendale 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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84° on Nov. 14, 2013, the hottest reading for this week of the year since 1975. Next is 82° in 1995.
Allendale’s center stands about 210 ft above sea level. Within three miles the land runs from 100 ft to 820 ft, a difference of 720 ft: hilly country. The highest named summit within 15 miles is Mount Vaca, about 2,800 ft, 7 miles west-southwest.
Under the town center the state geologic map shows Plio-Pleistocene and Pliocene loosely consolidated deposits (sandstone, conglomerate), from the Miocene to Pleistocene, less than 23 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 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.
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.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 4 mi of the line.
Siltstone-mudstone. Age: Early Cretaceous, 113 to 145 million years old. About 4 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 3 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 million years old. About 2 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 Allendale reaches San Francisco Bay and the Pacific Ocean by way of Sweany Creek, Cache Slough and the Sacramento: about 45 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Allendale; river miles along the main stem, rounded.
Allendale has a cold desert climate. Summer afternoons average 97° in July; winter nights fall to about 38° in January. Barely 0.0 inches of rain fall in a normal year.
On November 14 Allendale normally reaches 67° and falls to 43°. The record high is 84°, in 2013; the record low 31°, in 1994. The most rain on this date, 2.70 in, fell in 1981.
Normals 1991–2020 and records since 1975 at Lake Solano, 4 miles north-northwest. NOAA, through RCC-ACIS.
