The Spillville 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
75° on Nov. 13, 1999, the hottest reading for this week of the year since 1893. Next is 73° in 1953.
Spillville’s center stands about 1,070 ft above sea level. Within three miles the land runs from 1,030 ft to 1,250 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Steamboat Rock, about 1,240 ft, 11 miles northwest.
Under the town center the state geologic map shows Maquoketa formation (shale, dolostone), from the Late Ordovician, 447 to 454 million years old.
The section below crosses 3 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 52×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, dolostone. Age: Late Ordovician, 447 to 454 million years old. About 17 mi of the line.
Dolostone, limestone. Age: Middle Devonian, 384 to 394 million years old. About 7 mi of the line.
Limestone, dolostone. Age: Middle Devonian to Late Devonian, 374 to 388 million years old. About 0.3 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 Spillville reaches the Gulf of America by way of Wonder Creek, the Turkey and the Mississippi: about 1,700 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Spillville; river miles along the main stem, rounded.
Spillville has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 10° in January. A normal year brings about 38 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Spillville normally reaches 47° and falls to 29°. The record high is 71°, in 2025; the record low −7°, in 1916. The most rain on this date, 1.08 in, fell in 1902.
Normals 1991–2020 and records since 1893 at Decorah, 11 miles northeast, 210 ft lower. NOAA, through RCC-ACIS.
