The Newcastle 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
Partly cloudy
Mostly cloudy
Showers likely; cooler
Partly cloudy
Showers likely
Showers likely
73° on Nov. 11, 2025, the hottest reading for this week of the year since 1905. Next is 72° in 2016.
Newcastle’s center stands about 5,310 ft above sea level. Within three miles the land runs from 5,200 ft to 6,250 ft, a difference of 1,050 ft: steep hill country. The highest named summit within 15 miles is Rencher Peak, about 8,760 ft, 14 miles south-southeast.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million 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 9×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 15 mi of the line.
Volcanic. Age: Eocene to Miocene, 5.3 to 56 million years old. About 5 mi of the line.
Felsic-volcanic. Age: Late Oligocene to Middle Miocene, 12 to 28 million years old. About 4 mi of the line.
Felsic-volcanic, andesite. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 0.6 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.
Newcastle has a dry-summer hot-summer continental climate. Summer afternoons average 90° in July; winter nights fall to about 17° in December. A normal year brings about 25 inches of snow; with the rain, that comes to about 15 inches of water.
Normals 1991–2020 and records since 1905 at Enterprise, 11 miles southwest. NOAA, through RCC-ACIS.
