The Primrose 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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73° on Nov. 14, 1999, the hottest reading for this week of the year since 1971. Next is 73° in 2022.
Primrose’s center stands about 1,030 ft above sea level. Within three miles the land runs from 870 ft to 1,160 ft, a difference of 290 ft: rolling country. The highest named summit within 15 miles is Blue Mounds, about 1,740 ft, 14 miles northwest.
Under the town center the state geologic map shows Ancell Group (sandstone), from the Ordovician, 445 to 487 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 46×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 16 mi of the line.
Dolostone. Age: Ordovician, 445 to 487 million years old. About 5 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 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 Primrose reaches the Gulf of America by way of the West Branch Sugar, the Sugar, the Pecatonica, the Rock River and the Mississippi: about 1,690 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Primrose; river miles along the main stem, rounded.
Primrose has a hot-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 11° in January. About 40 inches of rain fall in a normal year.
On November 14 Primrose normally reaches 47° and falls to 29°. The record high is 73°, in 1999; the record low 4°, in 1986. The most rain on this date, 1.00 in, fell in 1980.
Normals 1991–2020 and records since 1971 at Uw Arboretum - Madison, 16 miles northeast, 160 ft lower. NOAA, through RCC-ACIS.
