The Davenport 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.
Sunny
Mostly sunny; warmer
Mostly sunny
Mostly sunny
Partly cloudy
Mostly sunny
Chance of showers
8° on Nov. 11, 2019, the coldest reading for this week of the year since 1935. Next is 12° in 2014.
Davenport’s center stands about 600 ft above sea level. Within three miles the land runs from 540 ft to 730 ft, a difference of 190 ft: gently rolling country.
Under the town center the state geologic map shows Wapsipinicon Group (dolostone, limestone), from the Middle Devonian, 384 to 394 million years old.
The section below crosses 6 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.
Dolostone, mudstone. Age: Silurian, 425 to 434 million years old. About 8 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 million years old. About 6 mi of the line.
Shale, sandstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 5 mi of the line.
Dolostone, limestone. Age: Middle Devonian, 384 to 394 million years old. About 3 mi of the line.
Shale, sandstone, siltstone. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 2 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 1 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 Davenport reaches the Gulf of America by way of Duck Creek and the Mississippi: about 1,470 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Davenport; river miles along the main stem, rounded.
Davenport has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 13° in January. About 39 inches of rain fall in a normal year.
On November 14 Davenport normally reaches 49° and falls to 31°. The record high is 74°, in 2025; the record low 14°, in 2014. The most rain on this date, 0.57 in, fell in 1985.
Normals 1991–2020 and records since 1935 at Rock Island L&D 15, here. NOAA, through RCC-ACIS.
