The Zachary 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.
Partly cloudy
Chance of showers; warmer
Chance of showers
Mostly sunny; warmer
Mostly sunny
Mostly sunny
Mostly sunny
22° on Nov. 15, 1940, the coldest reading for this week of the year since 1892. Next is 24° in 1908.
Zachary’s center stands about 110 ft above sea level. Within three miles the land runs from 80 ft to 150 ft, a difference of 70 ft: gently rolling country.
Under the town center the state geologic map shows Prairie Terraces (clay, silt, sand), from the Pleistocene, less than 2.6 million 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 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.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 7 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 6 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Clay, silt. Age: Pleistocene, less than 2.6 million years old. About 3 mi of the line.
Silt, clay. Age: Holocene, less than 12,000 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 Zachary reaches Lake Pontchartrain and the Gulf of America by way of the Comite and the Amite: about 95 river miles.
Lake on the way: Lake Maurepas.
55 miles of the trip are on the Amite.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Zachary; river miles along the main stem, rounded.
Zachary has a humid subtropical climate. Summer afternoons average 92° in July; winter nights fall to about 42° in January. About 62 inches of rain fall in a normal year.
On November 14 Zachary normally reaches 71° and falls to 48°. The record high is 85°, in 1951; the record low 26°, in 1907. The most rain on this date, 2.00 in, fell in 1909.
Normals 1991–2020 and records since 1892 from the Baton Rouge Area threaded record (Baton Rouge Metro Airport, 8 miles south). NOAA, through RCC-ACIS.
