The Mason 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 cloudy
Showers likely
Mostly cloudy; cooler
Partly cloudy
Partly cloudy
Partly cloudy
Partly cloudy
92° on Nov. 15, 2025, the hottest reading for this week of the year since 1941. Next is 89° in 1995.
Mason’s center stands about 1,530 ft above sea level. Within three miles the land runs from 1,460 ft to 1,810 ft, a difference of 350 ft: rolling country. The highest named summit within 15 miles is Mason Mountains, about 2,080 ft, 9 miles northwest.
Under the town center the state geologic map shows Packsaddle Schist, from the Proterozoic, 542 to 2,500 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 25×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist. Age: Proterozoic, 542 to 2,500 million years old. About 16 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 4 mi of the line.
Sandstone. Age: Middle Cambrian, 497 to 521 million years old. About 3 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 0.8 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 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.
A raindrop that lands in Mason reaches the Gulf of America by way of Comanche Creek, the Llano and the Colorado: about 460 river miles.
Lakes on the way: Lake Marble Falls and Lake Lyndon B Johnson.
320 miles of the trip are on the Colorado.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mason; river miles along the main stem, rounded.
Mason has a humid subtropical climate. Summer afternoons average 96° in August; winter nights fall to about 34° in January. About 29 inches of rain fall in a normal year.
On November 14 Mason normally reaches 70° and falls to 44°. The record high is 86°, in 2025; the record low 23°, in 2018. The most rain on this date, 2.00 in, fell in 2001.
Normals 1991–2020 and records since 1941 at Mason, here. NOAA, through RCC-ACIS.
