The Borgholm 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.
Mostly sunny
Mostly sunny; warmer
Partly cloudy
Partly cloudy
Mostly cloudy
Partly cloudy
Showers likely
72° on Nov. 14, 1999, the hottest reading for this week of the year since 1897. Next is 69° in 1953.
Borgholm’s center stands about 1,060 ft above sea level. Within three miles the land runs from 1,000 ft to 1,120 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Interlayered volcanic, volcaniclastic, sedimentary, and hypabyssal intrusive rocks (volcanic, sedimentary, hypabyssal), from the Paleoproterozoic, 1.6 to 2.5 billion years old.
The section below crosses 9 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 8 mi of the line.
Mylonite, gneiss, schist. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 8 mi of the line.
Granodiorite, granite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 2 mi of the line.
Gabbro, pyroxenite, diorite. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 2 mi of the line.
Granitic. Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 2 mi of the line.
Age: Paleoproterozoic, 1.8 to 2 billion years old. About 1 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 3 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 Borgholm reaches the Gulf of America by way of the Rum and the Mississippi: about 1,960 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Borgholm; river miles along the main stem, rounded.
Borgholm has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 1° in January. A normal year brings about 49 inches of snow; with the rain, that comes to about 31 inches of water.
On November 14 Borgholm normally reaches 40° and falls to 22°. The record high is 72°, in 1999; the record low −6°, in 1919. The most rain on this date, 1.11 in, fell in 1909.
Normals 1991–2020 and records since 1897 at Milaca, 4 miles west. NOAA, through RCC-ACIS.
