The Lynn 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
Mostly sunny
Partly cloudy
Mostly cloudy
Partly cloudy
Showers likely
74° on Nov. 14, 1990, the hottest reading for this week of the year since 1887. Next is 69° in 1953.
Lynn’s center stands about 1,070 ft above sea level. Within three miles the land runs from 1,040 ft to 1,090 ft, a difference of 50 ft: nearly flat ground.
Under the town center the state geologic map shows Leucogranite (leucocratic-granitic), from the Neoarchean, 2.5 to 2.8 billion years old.
The section below crosses 7 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.
Tonalite, granodiorite, diorite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 8 mi of the line.
Schist, slate. Age: Paleoproterozoic, 1.6 to 2.5 billion years old. About 7 mi of the line.
Sandstone, siltstone, shale. Age: Middle Cambrian to Cambrian, 487 to 521 million years old. About 3 mi of the line.
Leucocratic-granitic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 3 mi of the line.
Age: Paleoproterozoic, 1.6 to 1.8 billion years old. About 3 mi of the line.
Gabbroic, dioritic. Age: Archean to Paleoproterozoic. 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. 1 smaller unit 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 Lynn reaches the Gulf of America by way of McCuen Creek, the South Fork Crow, the Crow and the Mississippi: about 1,940 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lynn; river miles along the main stem, rounded.
Lynn has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about 0° in January. About 30 inches of rain fall in a normal year.
On November 14 Lynn normally reaches 40° and falls to 22°. The record high is 74°, in 1990; the record low −6°, in 1940. The most rain on this date, 0.70 in, fell in 1951.
Normals 1991–2020 and records since 1887 at Litchfield, 20 miles north-northwest. NOAA, through RCC-ACIS.
