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.
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73° on Nov. 11, 2020, the hottest reading for this week of the year since 1926. Next is 70° in 1928.
Hannibal’s center stands about 340 ft above sea level. Within three miles the land runs from 300 ft to 490 ft, a difference of 190 ft: gently rolling country. The highest named summit within 15 miles is Cuddeback Hill, about 610 ft, 11 miles southwest.
Under the town center the state geologic map shows Clinton Group (shale), from the Silurian, 434 to 445 million years old.
The section below crosses 5 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 61×. 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. Age: Silurian, 434 to 445 million years old. About 11 mi of the line.
Shale. Age: Late Ordovician to Silurian, 434 to 459 million years old. About 5 mi of the line.
Dolostone. Age: Silurian, 425 to 428 million years old. About 2 mi of the line.
Shale. Age: Silurian, 422 to 428 million years old. About 2 mi of the line.
Sandstone. Age: Late Ordovician, 445 to 459 million years old. About 0.5 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 Hannibal reaches Lake Ontario by way of Muck Creek and Ninemile Creek: about 13 river miles. From the lake it goes down the St. Lawrence to the Atlantic.
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 warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 19° in January. A normal year brings about 140 inches of snow; with the rain, that comes to about 43 inches of water.
On November 14 Hannibal normally reaches 48° and falls to 36°. The record high is 68°, in 1994; the record low 16°, in 1996. The most rain on this date, 0.85 in, fell in 1972.
Normals 1991–2020 and records since 1926 from the Oswego Area threaded record (Oswego, 9 miles north-northeast). NOAA, through RCC-ACIS.
