The Perry Park 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
Sunny; warmer
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Mostly sunny
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Chance of showers
76° on Nov. 16, 2016, the hottest reading for this week of the year since 1902. Next is 74° in 1953.
Perry Park’s center stands about 6,490 ft above sea level. Within three miles the land runs from 6,230 ft to 8,630 ft, a difference of 2,400 ft: mountain country. The highest named summit within 15 miles is Thunder Butte, about 9,770 ft, 12 miles west-southwest.
Under the town center the state geologic map shows Fountain Fm (arkose, conglomerate), from the Carboniferous to Permian, 252 to 324 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 6×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Granite, alkali-feldspar-granite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 11 mi of the line.
Arkose, conglomerate, shale. Age: Paleocene to Eocene, 34 to 66 million years old. About 7 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 3 mi of the line.
Arkose, conglomerate. Age: Carboniferous to Permian, 252 to 324 million years old. About 1 mi of the line.
Arkose, shale, mudstone. Age: Late Cretaceous to Paleocene, 56 to 100 million years old. About 0.9 mi of the line.
Sandstone, shale, limestone. Age: Permian to Early Triassic, 247 to 299 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. 2 smaller units along the line are not listed.
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 Perry Park reaches the Gulf of America by way of Bear Creek, West Plum Creek, the South Platte, the Platte, the Missouri and the Mississippi: about 2,440 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 Perry Park; river miles along the main stem, rounded.
Perry Park has a cold semi-arid climate. Summer afternoons average 84° in July; winter nights fall to about 14° in January. A normal year brings about 59 inches of snow; with the rain, that comes to about 16 inches of water.
On November 14 Perry Park normally reaches 54° and falls to 23°. The record high is 74°, in 1953; the record low −4°, in 2000. The most rain on this date, 0.48 in, fell in 1980.
Normals 1991–2020 and records since 1902 at Cheesman, 16 miles west, 380 ft higher. NOAA, through RCC-ACIS.
