The Harper 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
Showers likely
Mostly cloudy; cooler
Partly cloudy
Partly cloudy
Chance of showers
Partly cloudy
20° on Nov. 14, 2018, the coldest reading for this week of the year since 1974. Next is 22° in 1987.
Harper’s center stands about 2,050 ft above sea level. Within three miles the land runs from 1,960 ft to 2,220 ft, a difference of 260 ft: rolling country. The highest named summit within 15 miles is Hermans Point, about 2,240 ft, 9 miles north.
Under the town center the state geologic map shows Edwards Limestone, from the Early Cretaceous, 100 to 113 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 37×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Early Cretaceous, 100 to 113 million years old. About 19 mi of the line.
Limestone, marlstone. Age: Early Cretaceous, 100 to 145 million years old. About 2 mi of the line.
Fine-detrital, coarse-detrital. Age: Holocene, less than 12,000 years old. About 2 mi of the line.
Limestone. Age: Early Cretaceous, 100 to 145 million years old. About 1 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 Harper reaches the Gulf of America by way of the Pedernales and the Colorado: about 470 river miles.
Lake on the way: Lake Marble Falls.
320 miles of the trip are on the Colorado.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Harper; river miles along the main stem, rounded.
Harper has a humid subtropical climate. Summer afternoons average 93° in August; winter nights fall to about 34° in January. About 31 inches of rain fall in a normal year.
On November 14 Harper normally reaches 68° and falls to 44°. The record high is 85°, in 2005; the record low 20°, in 2018. The most rain on this date, 0.73 in, fell in 1993.
Normals 1991–2020 and records since 1974 at Kerrville 3 NNE, 18 miles south-southeast, 250 ft lower. NOAA, through RCC-ACIS.
