The Three Rocks 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.
Mostly sunny
Partly cloudy
Chance of showers; cooler
Sunny
Showers likely
Showers likely
Mostly sunny
92° on Nov. 14, 1995, the hottest reading for this week of the year since 1942. Next is 85° in 2016.
Three Rocks’s center stands about 410 ft above sea level. Within three miles the land runs from 280 ft to 600 ft, a difference of 320 ft: rolling country. The highest named summit within 15 miles is Wright Mountain, about 4,530 ft, 15 miles south-southwest.
Under the town center the state geologic map shows Quaternary alluvium and marine deposits (coarse-detrital), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 6 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 16 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pleistocene, less than 23 million years old. About 3 mi of the line.
Sandstone, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Mudstone, sandstone. Age: Paleocene to Oligocene, 23 to 66 million years old. About 2 mi of the line.
Sandstone, mudstone. Age: Oligocene to Pliocene, 2.6 to 34 million years old. About 0.5 mi of the line.
Sandstone, mudstone. Age: Paleocene, 56 to 66 million years old. About 0.4 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.
Three Rocks has a cold desert climate. Summer afternoons average 99° in July; winter nights fall to about 36° in December. Barely 0.0 inches of rain fall in a normal year.
On November 14 Three Rocks normally reaches 70° and falls to 42°. The record high is 92°, in 1995; the record low 28°, in 1961. The most rain on this date, 1.25 in, fell in 1953.
Normals 1991–2020 and records since 1942 at Five Points 5 SSW, 16 miles southeast, 120 ft lower. NOAA, through RCC-ACIS.
