The Andover 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.
Mostly cloudy
Partly cloudy; warmer
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75° on Nov. 11, 2020, the hottest reading for this week of the year since 1996. Next is 70° in 2022.
Andover’s center stands about 650 ft above sea level. Within three miles the land runs from 610 ft to 2,060 ft, a difference of 1,450 ft: steep hill country. The highest named summit within 15 miles is Mount Kearsarge, about 2,910 ft, 4 miles south-southwest.
Under the town center the state geologic map shows Upper part of Rangeley Formation (pelitic-schist, metasandstone), from the Silurian, 434 to 445 million years old.
The section below crosses 8 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 8×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Quartzite, metasedimentary. Age: Silurian, 422 to 445 million years old. About 7 mi of the line.
Schist, granofels. Age: Silurian, 425 to 434 million years old. About 4 mi of the line.
Granodiorite. Age: Early Devonian, 394 to 422 million years old. About 3 mi of the line.
Metasedimentary. Age: Early Devonian, 394 to 422 million years old. About 3 mi of the line.
Metaclastic. Age: Early Devonian, 394 to 422 million years old. About 3 mi of the line.
Quartz-diorite, tonalite, granodiorite. Age: Early Devonian, 394 to 422 million years old. About 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. 2 smaller units along the line are not listed.
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 Andover reaches the Atlantic Ocean by way of Mountain Brook, the Blackwater, the Contoocook and the Merrimack: about 130 river miles.
100 miles of the trip are on the Merrimack.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Andover; river miles along the main stem, rounded.
Andover has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about 13° in January. About 49 inches of rain fall in a normal year.
Normals 1991–2020 and records since 1996 at Salisbury, 7 miles southeast, 100 ft lower. NOAA, through RCC-ACIS.
