The Round Lake 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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68° on Nov. 13, 1999, the hottest reading for this week of the year since 1893. Next is 65° in 1917.
Round Lake’s center stands about 1,450 ft above sea level. Within three miles the land runs from 1,360 ft to 1,520 ft, a difference of 160 ft: gently rolling country. The highest named summit within 15 miles is Mount Telemark, about 1,710 ft, 11 miles northwest.
Under the town center the state geologic map shows Migmatitic gneiss and amphibolite (Late to Early Archean) (gneiss, amphibolite), from the Paleoarchean, 3.2 to 3.6 billion years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 58×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss, amphibolite. Age: Paleoarchean, 3.2 to 3.6 billion years old. About 12 mi of the line.
Biotite-schist. Age: Paleoproterozoic, 1.8 to 1.9 billion years old. About 7 mi of the line.
Gneiss, amphibolite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 4 mi of the line.
Basalt, basaltic-andesite. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 0.7 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 Round Lake reaches the Gulf of America by way of Hay Creek, the Chippewa and the Mississippi: about 1,940 river miles.
Lakes on the way: Moonshine Lake, Lake Wissota and Holcombe Flowage.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Round Lake; river miles along the main stem, rounded.
Round Lake has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 2° in January. About 31 inches of rain fall in a normal year.
On November 14 Round Lake normally reaches 40° and falls to 24°. The record high is 62°, in 2025; the record low −6°, in 1943. The most rain on this date, 1.60 in, fell in 1909.
Normals 1991–2020 and records since 1893 from the Hayward Area threaded record (Hayward Municipal Airport, 16 miles west, 240 ft lower). NOAA, through RCC-ACIS.
