The New London 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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Partly cloudy; warmer
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3° on Nov. 17, 1959, the coldest reading for this week of the year since 1948. Next is 10° in 1986.
New London’s center stands about 660 ft above sea level. Within three miles the land runs from 490 ft to 720 ft, a difference of 230 ft: rolling country. The highest named summit within 15 miles is Pickerton Hill, about 840 ft, 11 miles east-southeast.
Under the town center the state geologic map shows Leemon Formation, Maquoketa Group, Cape Limestone, Kimmswick Limestone, Noix-Cyrene Limestone, Maquoketa Shale, from the Middle Ordovician to Late Ordovician, 445 to 471 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 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Limestone. Age: Carboniferous, 324 to 359 million years old. About 11 mi of the line.
Limestone. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 6 mi of the line.
Limestone, siltstone. Age: Carboniferous, 324 to 359 million years old. About 3 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 3 mi of the line.
Limestone, sandstone. Age: Early Devonian to Late Devonian, 359 to 422 million years old. About 0.3 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 New London reaches the Gulf of America by way of the Salt River and the Mississippi: about 1,290 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of New London; river miles along the main stem, rounded.
New London has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 21° in January. About 38 inches of rain fall in a normal year.
On November 14 New London normally reaches 55° and falls to 36°. The record high is 81°, in 1999; the record low 10°, in 1986. The most rain on this date, 0.55 in, fell in 1985.
Normals 1991–2020 and records since 1948 at Saverton Lock And Dam 22, 9 miles east-northeast, 190 ft lower. NOAA, through RCC-ACIS.
