The Thendara 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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68° on Nov. 12, 2020, the hottest reading for this week of the year since 1931. Next is 66° in 2012.
Thendara’s center stands about 1,740 ft above sea level. Within three miles the land runs from 1,700 ft to 2,340 ft, a difference of 640 ft: hilly country. The highest named summit within 15 miles is Seventh Lake Mountain, about 2,910 ft, 13 miles east.
Under the town center the state geologic map shows Undivided metasedimentary rock and related migmatite (metasedimentary, migmatite), from the Mesoproterozoic, 1 to 1.6 billion 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 17×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 7 mi of the line.
Metasedimentary, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 5 mi of the line.
Charnockite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Metasedimentary, migmatite. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 4 mi of the line.
Charnockite, gneiss. Age: Mesoproterozoic, 1 to 1.6 billion 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.
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 Thendara reaches Lake Ontario by way of the Middle Branch Moose, the Moose and the Black River: about 100 river miles. From the lake it goes down the St. Lawrence to the Atlantic.
75 miles of the trip are on the Black River.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Thendara; river miles along the main stem, rounded.
Thendara has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 7° in January. A normal year brings about 154 inches of snow; with the rain, that comes to about 50 inches of water.
Normals 1991–2020 and records since 1931 at Big Moose 3 SE, 10 miles northeast, 200 ft higher. NOAA, through RCC-ACIS.
