The Macon-Bibb County 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. 11, 2020, the hottest reading for this week of the year since 1892. Next is 85° in 1958.
Macon-Bibb County’s center stands about 370 ft above sea level. Within three miles the land runs from 300 ft to 520 ft, a difference of 220 ft: rolling country. The highest named summit within 15 miles is Andrews Hill, about 600 ft, 9 miles east-southeast.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 55×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Biotite-gneiss. Age: Precambrian to Paleozoic. About 6 mi of the line.
Fine-detrital. Age: Quaternary, less than 2.6 million years old. About 6 mi of the line.
Clay, sand. Age: Cretaceous, 66 to 145 million years old. About 6 mi of the line.
Granite, gneiss. Age: Precambrian to Paleozoic. About 3 mi of the line.
Sand, clay. Age: Cretaceous, 66 to 145 million years old. About 2 mi of the line.
Sand, clay. Age: Cretaceous to Tertiary, 2.6 to 145 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. 1 smaller unit 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 Macon-Bibb County reaches the Atlantic Ocean by way of Rocky Creek, Tobesofkee Creek, the Ocmulgee and the Altamaha: about 320 river miles.
180 miles of the trip are on the Ocmulgee.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Macon-Bibb County; river miles along the main stem, rounded.
Macon-Bibb County has a humid subtropical climate. Summer afternoons average 94° in July; winter nights fall to about 36° in January. About 47 inches of rain fall in a normal year.
On November 14 Macon-Bibb County normally reaches 70° and falls to 42°. The record high is 83°, in 1955; the record low 21°, in 2013. The most rain on this date, 1.40 in, fell in 1957.
Normals 1991–2020 and records since 1892 from the Macon Area threaded record (Macon Middle Ga Regional Airport, 9 miles south-southeast). NOAA, through RCC-ACIS.
