The La Salle 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.
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83° on Nov. 16, 2016, the hottest reading for this week of the year since 1967. Next is 80° in 1999.
La Salle’s center stands about 4,680 ft above sea level. Within three miles the land runs from 4,640 ft to 4,800 ft, a difference of 160 ft: gently rolling country. The highest named summit within 15 miles is Antelope Hill, about 4,940 ft, 12 miles northwest.
Under the town center the state geologic map shows Gravels and alluviums (gravel, unconsolidated), from the Pleistocene, less than 0.5 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 47×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gravel, unconsolidated. Age: Pleistocene, less than 0.5 million years old. About 16 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Sand, silt. Age: Quaternary, less than 2.6 million years old. About 3 mi of the line.
Sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 2 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 0.5 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 La Salle reaches the Gulf of America by way of the South Platte, the Platte, the Missouri and the Mississippi: about 2,340 river miles.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of La Salle; river miles along the main stem, rounded.
La Salle has a cold semi-arid climate. Summer afternoons average 92° in July; winter nights fall to about 18° in January. A normal year brings about 35 inches of snow; with the rain, that comes to about 15 inches of water.
On November 14 La Salle normally reaches 54° and falls to 26°. The record high is 78°, in 2025; the record low 4°, in 2014. The most rain on this date, 0.50 in, fell in 1993.
Normals 1991–2020 and records since 1967 at Greeley Unc, 4 miles north. NOAA, through RCC-ACIS.
