The Brecon 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
Mostly cloudy
Partly cloudy
Sunny
Mostly sunny
Mostly sunny
Mostly sunny
10° on Nov. 17, 1959, the coldest reading for this week of the year since 1911. Next is 10° in 2019.
Brecon’s center stands about 870 ft above sea level. Within three miles the land runs from 640 ft to 950 ft, a difference of 310 ft: rolling country.
Under the town center the state geologic map shows Grant Lake and Fairview Formations, Miamitown Shale, Undivided (shale, limestone), from the Late Ordovician, 445 to 459 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 42×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale, limestone. Age: Late Ordovician, 445 to 459 million years old. About 11 mi of the line.
Shale, limestone. Age: Late Ordovician, 445 to 454 million years old. About 10 mi of the line.
Shale. Age: Middle Ordovician to Late Ordovician, 445 to 471 million years old. About 2 mi of the line.
Limestone, shale. Age: Late Ordovician, 445 to 459 million years old. About 0.9 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 Brecon reaches the Gulf of America by way of Sharon Creek, Mill Creek, the Ohio and the Mississippi: about 1,490 river miles.
970 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Brecon; river miles along the main stem, rounded.
Brecon has a hot-summer humid continental climate. Summer afternoons average 87° in July; winter nights fall to about 21° in January. About 45 inches of rain fall in a normal year.
On November 14 Brecon normally reaches 54° and falls to 33°. The record high is 78°, in 1931; the record low 10°, in 2019. The most rain on this date, 1.45 in, fell in 2011.
Normals 1991–2020 and records since 1911 at Fairfield, 13 miles west-northwest, 300 ft lower. NOAA, through RCC-ACIS.
