The Mandeville 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.
Sunny
Partly cloudy
Chance of showers
Mostly sunny; warmer
Mostly sunny
Partly cloudy
Mostly sunny
23° on Nov. 15, 1969, the coldest reading for this week of the year since 1956. Next is 27° in 1963.
Mandeville’s center stands about 12 ft above sea level. Within three miles the land runs from 0 ft to 50 ft, a difference of 50 ft: nearly flat ground. Open water lies within three miles.
Under the town center the state geologic map shows Alluvium (clay), from the Holocene, less than 12,000 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.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 10 mi of the line.
Clay. Age: Holocene, less than 12,000 years old. About 3 mi of the line.
Clay, silt, sand. Age: Pleistocene, less than 2.6 million years old. About 0.4 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.
Rain that falls on Mandeville runs straight into Lake Pontchartrain and the Gulf of America.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mandeville; river miles along the main stem, rounded.
Mandeville has a humid subtropical climate. Summer afternoons average 90° in July; winter nights fall to about 40° in January. About 62 inches of rain fall in a normal year.
On November 14 Mandeville normally reaches 70° and falls to 47°. The record high is 83°, in 2005; the record low 27°, in 1963. The most rain on this date, 3.80 in, fell in 1961.
Normals 1991–2020 and records since 1956 at Covington 8 WNW, 12 miles north-northwest. NOAA, through RCC-ACIS.
