The White Signal 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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10° on Nov. 13, 2018, the coldest reading for this week of the year since 1942. Next is 11° in 1980.
White Signal’s center stands about 5,990 ft above sea level. Within three miles the land runs from 5,740 ft to 6,810 ft, a difference of 1,070 ft: steep hill country. The highest named summit within 15 miles is Burro Peak, about 8,030 ft, 5 miles west-northwest.
Under the town center the state geologic map shows Mesoproterozoic granitic plutonic rocks, from the Mesoproterozoic, 1.2 to 1.6 billion years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granitic. Age: Mesoproterozoic, 1.2 to 1.6 billion years old. About 11 mi of the line.
Conglomerate-sandstone, volcanic. Age: Late Oligocene to Pleistocene, 0.1 to 28 million years old. About 6 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 6 mi of the line.
Granitic, syenitic. Age: Eocene to Pliocene, 2.6 to 56 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.
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.
White Signal has a cold semi-arid climate. Summer afternoons average 89° in June; winter nights fall to about 26° in January. A normal year brings about 13 inches of snow; with the rain, that comes to about 15 inches of water.
On November 14 White Signal normally reaches 61° and falls to 33°. The record high is 79°, in 1977; the record low 13°, in 1976. The most rain on this date, 0.45 in, fell in 2004.
Normals 1991–2020 and records since 1942 at White Signal, here. NOAA, through RCC-ACIS.
