The Lockhart 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
Mostly cloudy; cooler
Mostly sunny
Mostly cloudy
Chance of showers
Partly cloudy
21° on Nov. 15, 1969, the coldest reading for this week of the year since 1897. Next is 23° in 1970.
Lockhart’s center stands about 520 ft above sea level. Within three miles the land runs from 420 ft to 570 ft, a difference of 150 ft: gently rolling country. The highest named summit within 15 miles is Koeglar Hill, about 690 ft, 8 miles west.
Under the town center the state geologic map shows Leona Formation (coarse-detrital, fine-detrital), from the Pleistocene, 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 54×. 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, fine-detrital. Age: Pleistocene, less than 2.6 million years old. About 8 mi of the line.
Clay, siltstone-mudstone. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Mudstone. Age: Late Paleocene to Early Eocene, 48 to 59 million years old. About 4 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Sand. Age: Pleistocene to Holocene, less than 2.6 million years old. About 0.7 mi of the line.
Gravel. Age: Pleistocene, less than 2.6 million years old. About 0.3 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 Lockhart reaches the Gulf of America by way of Plum Creek, the San Marcos, the Guadalupe and the South Guadalupe: about 230 river miles.
180 miles of the trip are on the Guadalupe.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lockhart; river miles along the main stem, rounded.
Lockhart has a humid subtropical climate. Summer afternoons average 98° in August; winter nights fall to about 40° in January. About 35 inches of rain fall in a normal year.
On November 14 Lockhart normally reaches 74° and falls to 49°. The record high is 90°, in 2020; the record low 24°, in 2018. The most rain on this date, 1.20 in, fell in 1959.
Normals 1991–2020 and records since 1897 at Luling, 14 miles south, 120 ft lower. NOAA, through RCC-ACIS.
