The Nunn 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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79° on Nov. 16, 2016, the hottest reading for this week of the year since 1893. Next is 78° in 1894.
Nunn’s center stands about 5,190 ft above sea level. Within three miles the land runs from 5,100 ft to 5,310 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Wildhorse Tit, about 5,430 ft, 13 miles east-northeast.
Under the town center the state geologic map shows Older gravels and alluviums (gravel, unconsolidated), from the Pleistocene, 0.2 to 1.6 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 22×. 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, claystone, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 13 mi of the line.
Gravel, unconsolidated. Age: Pleistocene, 0.2 to 1.6 million years old. About 9 mi of the line.
Sandstone, conglomerate. Age: Miocene to Pliocene, 2.6 to 23 million years old. About 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 Nunn reaches the Gulf of America by way of Spring Creek, the South Platte, the Platte, the Missouri and the Mississippi: about 2,360 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 Nunn; river miles along the main stem, rounded.
Nunn has a cold semi-arid climate. Summer afternoons average 87° in July; winter nights fall to about 18° in January. A normal year brings about 51 inches of snow; with the rain, that comes to about 16 inches of water.
On November 14 Nunn normally reaches 53° and falls to 27°. The record high is 78°, in 1894; the record low −13°, in 1916. The most rain on this date, 0.48 in, fell in 1968.
Normals 1991–2020 and records since 1893 at Fort Collins, 18 miles west-southwest, 190 ft lower. NOAA, through RCC-ACIS.
