The Annawan 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
Mostly sunny
Mostly sunny
Partly cloudy
Partly cloudy
Chance of showers
75° on Nov. 11, 2020, the hottest reading for this week of the year since 1939. Next is 75° in 2022.
Annawan’s center stands about 630 ft above sea level. Within three miles the land runs from 610 ft to 700 ft, a difference of 90 ft: gently rolling country. The highest named summit within 15 miles is Gravel Hill, about 830 ft, 14 miles east-southeast.
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. Age: Early Pennsylvanian to Middle Pennsylvanian, 307 to 324 million years old. About 13 mi of the line.
Shale, limestone. Age: Late Pennsylvanian, 304 to 307 million years old. About 6 mi of the line.
Shale, sandstone, coal. Age: Middle Pennsylvanian to Late Pennsylvanian, 304 to 315 million years old. About 5 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 Annawan reaches the Gulf of America by way of Coal Creek, Mud Creek, the Green River, the Rock River and the Mississippi: about 1,500 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Annawan; river miles along the main stem, rounded.
Annawan has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 14° in January. A normal year brings about 31 inches of snow; with the rain, that comes to about 40 inches of water.
On November 14 Annawan normally reaches 49° and falls to 30°. The record high is 74°, in 1999; the record low 4°, in 1986. The most rain on this date, 0.80 in, fell in 1991.
Normals 1991–2020 and records since 1939 at Kewanee 1 E, 11 miles south, 150 ft higher. NOAA, through RCC-ACIS.
