The Harrison 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.
Partly cloudy
Sunny; warmer
Mostly sunny
Partly cloudy
Partly cloudy
Partly cloudy; cooler
Showers likely
80° on Nov. 15, 2025, the hottest reading for this week of the year since 1909. Next is 79° in 1953.
Harrison’s center stands about 1,590 ft above sea level. Within three miles the land runs from 1,570 ft to 1,630 ft, a difference of 60 ft: nearly flat ground.
Under the town center the state geologic map shows Pierre Shale (shale, bentonite), from the Late Cretaceous, 66 to 100 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.
Shale, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 13 mi of the line.
Chalk, marlstone, shale. Age: Late Cretaceous, 66 to 100 million years old. About 10 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 1 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.
Harrison has a hot-summer humid continental climate. Summer afternoons average 86° in July; winter nights fall to about 8° in January. A normal year brings about 38 inches of snow; with the rain, that comes to about 24 inches of water.
On November 14 Harrison normally reaches 45° and falls to 23°. The record high is 77°, in 1953; the record low −18°, in 1959. The most rain on this date, 1.10 in, fell in 1971.
Normals 1991–2020 and records since 1909 at White Lake, 19 miles north-northwest. NOAA, through RCC-ACIS.
