The Redlands 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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6° on Nov. 13, 1916, the coldest reading for this week of the year since 1893. Next is 8° in 1955.
Redlands’s center stands about 4,660 ft above sea level. Within three miles the land runs from 4,510 ft to 6,060 ft, a difference of 1,550 ft: steep hill country. The highest named summit within 15 miles is Monument Rock, about 8,560 ft, 11 miles south-southwest.
Under the town center the state geologic map shows Dakota Sandstone and Burro Canyon Fm (sandstone, shale, conglomerate), from the Early Cretaceous to Late Cretaceous, 66 to 145 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 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.
Shale, sandstone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 9 mi of the line.
Sandstone, mudstone, claystone. Age: Late Jurassic, 145 to 164 million years old. About 6 mi of the line.
Siltstone, shale, sandstone. Age: Late Triassic to Late Jurassic, 145 to 237 million years old. About 4 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 2 mi of the line.
Sandstone, shale, conglomerate. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Biotite-gneiss, schist, migmatite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 0.9 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 Redlands reaches the Gulf of California by way of the Colorado: about 1,150 river miles.
Lakes on the way: Lake Mead, Lake Powell, Lake Mohave and Lake Havasu.
Seldom reaches the sea. Dams and canals now take nearly all of the Colorado before its old delta in Mexico.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Redlands; river miles along the main stem, rounded.
Redlands has a cold semi-arid climate. Summer afternoons average 95° in July; winter nights fall to about 17° in January. A normal year brings about 18 inches of snow; with the rain, that comes to about 9 inches of water.
On November 14 Redlands normally reaches 53° and falls to 28°. The record high is 72°, in 1903; the record low 8°, in 1916. The most rain on this date, 0.53 in, fell in 1987.
Normals 1991–2020 and records since 1893 from the Grand Junction Area threaded record (Grand Junction Walker Field, 6 miles northeast, 160 ft higher). NOAA, through RCC-ACIS.
