The Zena 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
Partly cloudy; warmer
Mostly sunny
Sunny
Partly cloudy
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Mostly sunny
83° on Nov. 16, 2025, the hottest reading for this week of the year since 1923. Next is 82° in 1934.
Zena’s center stands about 950 ft above sea level. Within three miles the land runs from 740 ft to 1,010 ft, a difference of 270 ft: rolling country.
Under the town center the state geologic map shows Keokuk and Reeds Spring Formations and St. Joe Group (chert, limestone), from the Carboniferous, 324 to 359 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 45×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Chert, limestone. Age: Carboniferous, 324 to 359 million years old. About 20 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 Zena reaches the Gulf of America by way of the Neosho, the Arkansas and the Mississippi: about 1,100 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
600 miles of the trip are on the Mississippi.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Zena; river miles along the main stem, rounded.
Zena has a humid subtropical climate. Summer afternoons average 91° in July; winter nights fall to about 26° in January. A normal year brings about 6 inches of snow; with the rain, that comes to about 47 inches of water.
On November 14 Zena normally reaches 61° and falls to 39°. The record high is 82°, in 1999; the record low 13°, in 1940. The most rain on this date, 3.15 in, fell in 1985.
Normals 1991–2020 and records since 1923 at Spavinaw, 14 miles west-southwest, 260 ft lower. NOAA, through RCC-ACIS.
