The Iona 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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69° on Nov. 17, 1953, the hottest reading for this week of the year since 1892. Next is 67° in 1999.
Iona’s center stands about 1,370 ft above sea level. Within three miles the land runs from 1,330 ft to 1,420 ft, a difference of 90 ft: gently rolling country.
Under the town center the state geologic map shows Slate and graywacke (slate, graywacke), from the Paleoproterozoic, 1.6 to 2 billion years old.
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.
Slate, graywacke. Age: Paleoproterozoic, 1.6 to 2 billion years old. About 24 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 Iona reaches the Gulf of America by way of Harris Creek, the Long Prairie, the Crow Wing and the Mississippi: about 2,030 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Iona; river miles along the main stem, rounded.
Iona has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about −1° in January. A normal year brings about 54 inches of snow; with the rain, that comes to about 31 inches of water.
On November 14 Iona normally reaches 38° and falls to 21°. The record high is 68°, in 1953; the record low −5°, in 1955. The most rain on this date, 1.47 in, fell in 1909.
Normals 1991–2020 and records since 1892 at Long Prairie, 8 miles south-southeast. NOAA, through RCC-ACIS.
