The Hannibal 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
Partly cloudy; warmer
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3.35 inches of rain fell in two days, the most for this week of the year since records began in 1902. The next wettest, 2.86 inches, fell in 1985.
Hannibal’s center stands about 510 ft above sea level. Within three miles the land runs from 450 ft to 770 ft, a difference of 320 ft: rolling country. The highest named summit within 15 miles is Pickerton Hill, about 840 ft, 15 miles southeast.
Under the town center the state geologic map shows Kinderhookian Series (limestone, siltstone), from the Carboniferous, 324 to 359 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 52×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Clay, silt, sand. Age: Holocene, less than 12,000 years old. About 8 mi of the line.
Limestone, siltstone. Age: Carboniferous, 324 to 359 million years old. About 6 mi of the line.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 4 mi of the line.
Limestone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 3 mi of the line.
Shale. Age: Middle Devonian to Late Devonian, 359 to 388 million years old. About 2 mi of the line.
Limestone, shale. Age: Early Mississippian, 347 to 359 million years old. About 0.7 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 Hannibal reaches the Gulf of America by way of Minnow Branch, Bear Creek and the Mississippi: about 1,280 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hannibal; river miles along the main stem, rounded.
Hannibal has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 18° in January. About 41 inches of rain fall in a normal year.
On November 14 Hannibal normally reaches 52° and falls to 34°. The record high is 80°, in 1999; the record low 6°, in 1940. The most rain on this date, 1.37 in, fell in 1913.
Normals 1991–2020 and records since 1902 at Hannibal Water Works, here, 200 ft higher. NOAA, through RCC-ACIS.
