The South Glastonbury 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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−11° on Nov. 13, 2014, the coldest reading for this week of the year since 1951. Next is −9° in 1986.
South Glastonbury’s center stands about 5,140 ft above sea level. Within three miles the land runs from 4,890 ft to 6,680 ft, a difference of 1,790 ft: steep hill country. The highest named summit within 15 miles is Emigrant Peak, about 10,790 ft, 7 miles southeast.
Under the town center the state geologic map shows Glacial deposit (unconsolidated), from the Pleistocene to Holocene, less than 1.8 million years old.
The section below crosses 4 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 4×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Andesite, dacite. Age: Early Eocene, 48 to 56 million years old. About 16 mi of the line.
Age: Tertiary, 2.6 to 66 million years old. About 5 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 1.8 million years old. About 3 mi of the line.
Gravel, sand, silt. Age: Pleistocene to Holocene, less than 1.8 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.
A raindrop that lands in South Glastonbury reaches the Gulf of America by way of the Yellowstone, the Missouri and the Mississippi: about 3,270 river miles.
Lakes on the way: Lake Oahe, Lake Sakakawea, Lake Sharpe and Lake Francis Case.
1,170 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of South Glastonbury; river miles along the main stem, rounded.
South Glastonbury has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 20° in January. A normal year brings about 63 inches of snow; with the rain, that comes to about 16 inches of water.
On November 14 South Glastonbury normally reaches 44° and falls to 27°. The record high is 71°, in 1999; the record low 3°, in 2014. The most rain on this date, 0.92 in, fell in 1996.
Normals 1991–2020 and records since 1951 at Livingston 12 S, 17 miles northeast. NOAA, through RCC-ACIS.
