The Andrew 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
74° on Nov. 14, 1999, the hottest reading for this week of the year since 1937. Next is 73° in 2022.
Andrew’s center stands about 880 ft above sea level. Within three miles the land runs from 680 ft to 910 ft, a difference of 230 ft: rolling country.
Under the town center the state geologic map shows Scotch Grove Formation (dolostone), from the Silurian, 431 to 440 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 42×. 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. Age: Silurian, 431 to 440 million years old. About 14 mi of the line.
Dolostone. Age: Late Ordovician to Silurian, 434 to 447 million years old. About 10 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 Andrew reaches the Gulf of America by way of Cedar Creek, the North Fork Maquoketa, the Maquoketa and the Mississippi: about 1,560 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Andrew; river miles along the main stem, rounded.
Andrew has a hot-summer humid continental climate. Summer afternoons average 85° in July; winter nights fall to about 12° in January. A normal year brings about 32 inches of snow; with the rain, that comes to about 38 inches of water.
On November 14 Andrew normally reaches 48° and falls to 30°. The record high is 74°, in 1999; the record low 3°, in 1986. The most rain on this date, 1.11 in, fell in 2001.
Normals 1991–2020 and records since 1937 at Bellevue L/D 12, 11 miles northeast, 280 ft lower. NOAA, through RCC-ACIS.
