The Somerset 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
Partly cloudy
Partly cloudy
Showers likely
74° on Nov. 13, 1999, the hottest reading for this week of the year since 1958. Next is 70° in 1990.
Somerset’s center stands about 860 ft above sea level. Within three miles the land runs from 820 ft to 1,030 ft, a difference of 210 ft: rolling country. The highest named summit within 15 miles is Big Mound, about 1,130 ft, 5 miles south-southeast.
Under the town center the state geologic map shows Cambrian, undivided (sandstone), from the Cambrian, 487 to 542 million years old.
The section below crosses 6 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 44×. 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: Cambrian, 487 to 542 million years old. About 7 mi of the line.
Dolostone. Age: Early Ordovician, 471 to 487 million years old. About 7 mi of the line.
Sandstone, siltstone, shale. Age: Cambrian, 487 to 497 million years old. About 4 mi of the line.
Dolostone, sandstone. Age: Early Ordovician, 471 to 487 million years old. About 3 mi of the line.
Sandstone. Age: Ordovician, 445 to 487 million years old. About 2 mi of the line.
Shale, limestone, sandstone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million 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.
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 Somerset reaches the Gulf of America by way of the Apple, the Saint Croix and the Mississippi: about 1,820 river miles.
Lakes on the way: Lake Pepin and Lake Mallalieu 175.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Somerset; river miles along the main stem, rounded.
Somerset has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 3° in January. A normal year brings about 52 inches of snow; with the rain, that comes to about 33 inches of water.
On November 14 Somerset normally reaches 44° and falls to 24°. The record high is 70°, in 1990; the record low −2°, in 1959. The most rain on this date, 0.67 in, fell in 2010.
Normals 1991–2020 and records since 1958 at Forest Lake 5 NE, 18 miles northwest. NOAA, through RCC-ACIS.
