The Lake Mary 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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−8° on Nov. 14, 1959, the coldest reading for this week of the year since 1940. Next is −5° in 1940.
Lake Mary’s center stands about 1,400 ft above sea level. Within three miles the land runs from 1,350 ft to 1,460 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Tower Hill, about 1,600 ft, 9 miles west-northwest.
Under the town center the state geologic map shows Schist and tonalitic to granodioritic paragneiss (schist, paragneiss), from the Neoarchean, 2.5 to 2.8 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 59×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Schist, paragneiss. Age: Neoarchean, 2.5 to 2.8 billion years old. About 10 mi of the line.
Orthogneiss. Age: Paleoarchean to Mesoarchean, 2.8 to 3.6 billion years old. About 7 mi of the line.
Conglomerate, sandstone, mudstone. Age: Late Cretaceous, 72 to 100 million years old. About 4 mi of the line.
Orthogneiss, migmatite. Age: Paleoarchean to Mesoarchean, 2.8 to 3.6 billion 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 Lake Mary reaches the Gulf of America by way of Lake Carlos, the Long Prairie, the Crow Wing and the Mississippi: about 2,100 river miles.
Lakes on the way: Lake Pepin and Lake Carlos.
1,750 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Lake Mary; river miles along the main stem, rounded.
Lake Mary has a dry-winter warm-summer continental climate. Summer afternoons average 80° in July; winter nights fall to about 2° in January. About 24 inches of rain fall in a normal year.
On November 14 Lake Mary normally reaches 38° and falls to 24°. The record high is 69°, in 1953; the record low −8°, in 1959. The most rain on this date, 0.22 in, fell in 1951.
Normals 1991–2020 and records since 1940 at Alexandria Chandler Field, 6 miles north-northeast. NOAA, through RCC-ACIS.
