The Troy 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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86° on Nov. 14, 1955, the hottest reading for this week of the year since 1891. Next is 82° in 1931.
Troy’s center stands about 360 ft above sea level. Within three miles the land runs from 310 ft to 480 ft, a difference of 170 ft: gently rolling country. The highest named summit within 15 miles is Logan Hill, about 540 ft, 7 miles north.
Under the town center the state geologic map shows Loess (silt), from the Quaternary, less than 2.6 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 64×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Silt. Age: Quaternary, less than 2.6 million years old. About 19 mi of the line.
Fine-detrital, coarse-detrital. Age: Quaternary, less than 2.6 million years old. About 4 mi of the line.
Fine-detrital. Age: Tertiary to Holocene, less than 66 million years old. About 0.8 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 Troy reaches the Gulf of America by way of Troy Creek, Davidson Creek, the Obion and the Mississippi: about 910 river miles.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Troy; river miles along the main stem, rounded.
Troy has a humid subtropical climate. Summer afternoons average 88° in July; winter nights fall to about 27° in January. A normal year brings about 6 inches of snow; with the rain, that comes to about 54 inches of water.
On November 14 Troy normally reaches 59° and falls to 37°. The record high is 86°, in 1955; the record low 12°, in 2019. The most rain on this date, 2.92 in, fell in 1957.
Normals 1991–2020 and records since 1891 at Union City, 8 miles east-northeast. NOAA, through RCC-ACIS.
