The Mount Calm 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.
Chance of showers
Showers likely; cooler
Partly cloudy
Sunny; warmer
Partly cloudy
Partly cloudy
Partly cloudy
3.23 inches of rain fell in two days, the most for this week of the year since records began in 1901. The next wettest, 2.96 inches, fell in 1907.
Mount Calm’s center stands about 610 ft above sea level. Within three miles the land runs from 540 ft to 660 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Wolfe City Formation (sandstone-mudstone), from the Late Cretaceous, 66 to 72 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone-mudstone. Age: Late Cretaceous, 66 to 72 million years old. About 13 mi of the line.
Claystone. Age: Late Cretaceous, 66 to 72 million years old. About 5 mi of the line.
Claystone. Age: Late Cretaceous, 66 to 72 million years old. About 3 mi of the line.
Limestone, carbonate. Age: Late Cretaceous, 66 to 72 million years old. About 1 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 1 mi of the line.
Coarse-detrital, fine-detrital. Age: Quaternary, less than 2.6 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. 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 Mount Calm reaches the Gulf of America by way of the Navasota and the Brazos: about 420 river miles.
Lake on the way: Lake Limestone.
230 miles of the trip are on the Brazos.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mount Calm; river miles along the main stem, rounded.
Mount Calm has a humid subtropical climate. Summer afternoons average 97° in July; winter nights fall to about 36° in January. About 36 inches of rain fall in a normal year.
On November 14 Mount Calm normally reaches 69° and falls to 46°. The record high is 91°, in 1989; the record low 21°, in 1940. The most rain on this date, 1.50 in, fell in 1954.
Normals 1991–2020 and records since 1901 from the Waco Area threaded record (Waco Regional Airport, 23 miles west-southwest, 110 ft lower). NOAA, through RCC-ACIS.
