The Altoona 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
Partly cloudy; warmer
Mostly sunny
Mostly sunny
Partly cloudy
Mostly sunny
Showers likely
81° on Nov. 13, 1999, the hottest reading for this week of the year since 1878. Next is 76° in 2001.
Altoona’s center stands about 960 ft above sea level. Within three miles the land runs from 860 ft to 980 ft, a difference of 120 ft: gently rolling country.
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 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.
Shale, sandstone, siltstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 13 mi of the line.
Shale, siltstone. Age: Middle Pennsylvanian, 307 to 315 million years old. About 10 mi of the line.
Dolostone, limestone. Age: Middle Mississippian to Late Mississippian, 324 to 347 million years old. About 0.4 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 Altoona reaches the Gulf of America by way of Little Fourmile Creek, Fourmile Creek, the Des Moines and the Mississippi: about 1,530 river miles.
Lake on the way: Roberts Creek.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Altoona; river miles along the main stem, rounded.
Altoona has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 14° in January. A normal year brings about 36 inches of snow; with the rain, that comes to about 36 inches of water.
On November 14 Altoona normally reaches 49° and falls to 31°. The record high is 74°, in 2025; the record low −1°, in 1959. The most rain on this date, 0.86 in, fell in 1947.
Normals 1991–2020 and records since 1878 from the Des Moines Area threaded record (Des Moines International Airport, 12 miles southwest). NOAA, through RCC-ACIS.
