The Hart 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
Partly cloudy
Partly cloudy
Partly cloudy
Showers likely
72° on Nov. 14, 1999, the hottest reading for this week of the year since 1948. Next is 70° in 2012.
Hart’s center stands about 1,200 ft above sea level. Within three miles the land runs from 810 ft to 1,300 ft, a difference of 490 ft: hilly country.
Under the town center the state geologic map shows Lower Ordovician (dolostone, sandstone), from the Early Ordovician, 471 to 487 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 30×. 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, sandstone. Age: Early Ordovician, 471 to 487 million years old. About 17 mi of the line.
Sandstone, siltstone, shale. Age: Cambrian, 487 to 497 million years old. About 6 mi of the line.
Sandstone, siltstone, shale. Age: Middle Cambrian to Cambrian, 487 to 521 million years old. About 0.9 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 Hart reaches the Gulf of America by way of Rush Creek, the Root and the Mississippi: about 1,710 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Hart; river miles along the main stem, rounded.
Hart has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 5° in January. About 37 inches of rain fall in a normal year.
On November 14 Hart normally reaches 45° and falls to 25°. The record high is 72°, in 1999; the record low 4°, in 1996. The most rain on this date, 0.32 in, fell in 2008.
Normals 1991–2020 and records since 1948 at Rushford, 5 miles south, 430 ft lower. NOAA, through RCC-ACIS.
