The Lamar 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
Mostly cloudy
Mostly sunny; warmer
Partly cloudy
Mostly sunny
Mostly sunny
Mostly sunny
−5° on Nov. 13, 2014, the coldest reading for this week of the year since 1893. Next is −4° in 1940.
Lamar’s center stands about 3,620 ft above sea level. Within three miles the land runs from 3,590 ft to 3,760 ft, a difference of 170 ft: gently rolling country.
Under the town center the state geologic map shows Modern alluvium (unconsolidated), from the Quaternary, 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 48×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Sandstone, shale. Age: Early Cretaceous, 100 to 145 million years old. About 5 mi of the line.
Shale, limestone. Age: Early Cretaceous to Late Cretaceous, 66 to 145 million years old. About 4 mi of the line.
Sand, silt. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 0.9 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 Lamar reaches the Gulf of America by way of the Arkansas and the Mississippi: about 1,700 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
810 miles of the trip are on the Arkansas.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lamar; river miles along the main stem, rounded.
Lamar has a cold semi-arid climate. Summer afternoons average 93° in July; winter nights fall to about 14° in January. A normal year brings about 30 inches of snow; with the rain, that comes to about 16 inches of water.
On November 14 Lamar normally reaches 57° and falls to 24°. The record high is 82°, in 1905; the record low −5°, in 2014. The most rain on this date, 0.66 in, fell in 1993.
Normals 1991–2020 and records since 1893 at Lamar, here. NOAA, through RCC-ACIS.
