The Hammond 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
Mostly sunny
Sunny
Partly cloudy
Mostly sunny
Partly cloudy
3.35 inches of rain fell in two days, the most for this week of the year since records began in 1952. The next wettest, 2.16 inches, fell in 2003.
Hammond’s center stands about 610 ft above sea level. Within three miles the land runs from 580 ft to 650 ft, a difference of 70 ft: gently rolling country.
Under the town center the state geologic map shows Wabash Formation (limestone, dolostone), from the Silurian, 422 to 445 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 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, limestone. Age: Silurian, 422 to 445 million years old. About 10 mi of the line.
Limestone, dolostone. Age: Silurian, 422 to 445 million years old. About 8 mi of the line.
Limestone. Age: Middle Devonian, 384 to 394 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.
Hammond straddles the St. Lawrence Divide. Rain on the north side runs to Lake Michigan; most of the rest goes to the Gulf of America.
From the center of town, a raindrop reaches the Gulf of America by way of the Calumet, the Calumet Sag Channel, the Chicago Sanitary and Ship Canal, the Des Plaines, the Illinois and the Mississippi: about 1,520 river miles. Rain that falls on Hammond runs only a short way, about 3 miles, to Lake Michigan. From there it moves on through the Great Lakes, over Niagara Falls and down the St. Lawrence to the Atlantic.
Lake on the way: Peoria Lake.
1,190 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hammond; river miles along the main stem, rounded.
Hammond has a hot-summer humid continental climate. Summer afternoons average 84° in July; winter nights fall to about 15° in January. A normal year brings about 28 inches of snow; with the rain, that comes to about 42 inches of water.
On November 14 Hammond normally reaches 49° and falls to 32°. The record high is 73°, in 1971; the record low 5°, in 1986. The most rain on this date, 1.03 in, fell in 1957.
Normals 1991–2020 and records since 1952 at Park Forest Water, 11 miles west-southwest, 100 ft higher. NOAA, through RCC-ACIS.
