The Mona 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.
Chance of showers
Partly cloudy; warmer
Mostly cloudy
Showers likely
Partly cloudy
Showers likely
Showers likely
76° on Nov. 15, 1999, the hottest reading for this week of the year since 1904. Next is 74° in 1953.
Mona’s center stands about 4,980 ft above sea level. Within three miles the land runs from 4,880 ft to 7,100 ft, a difference of 2,220 ft: mountain country. The highest named summit within 15 miles is Mount Nebo, about 11,840 ft, 5 miles east.
Under the town center the state geologic map shows Alluvium and colluvium (unconsolidated), from the Quaternary, less than 2.6 million years old.
The section below crosses 11 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 3×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Latite, quartz-latite. Age: Late Eocene to Oligocene, 23 to 38 million years old. About 6 mi of the line.
Unconsolidated. Age: Quaternary, less than 2.6 million years old. About 5 mi of the line.
Sandstone. Age: Carboniferous to Permian, 273 to 324 million years old. About 4 mi of the line.
Sandstone, mudstone. Age: Late Cretaceous, 72 to 84 million years old. About 3 mi of the line.
Siltstone-mudstone, sandstone. Age: Late Cretaceous to Early Eocene, 48 to 84 million years old. About 2 mi of the line.
Monzonite, granodiorite. Age: Late Eocene, 35 to 35 million years old. About 2 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 5 smaller units 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 Mona reaches Great Salt Lake by way of Currant Creek and the Jordan: about 95 river miles. Great Salt Lake has no outlet to the sea: the water leaves only by evaporating or soaking into the ground.
Lake on the way: Utah Lake.
50 miles of the trip are on the Jordan.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Mona; river miles along the main stem, rounded.
Mona has a hot-summer humid continental climate. Summer afternoons average 89° in July; winter nights fall to about 20° in January. A normal year brings about 45 inches of snow; with the rain, that comes to about 14 inches of water.
On November 14 Mona normally reaches 50° and falls to 29°. The record high is 73°, in 1990; the record low 12°, in 1994. The most rain on this date, 0.78 in, fell in 1955.
Normals 1991–2020 and records since 1904 at Nephi, 7 miles south, 170 ft higher. NOAA, through RCC-ACIS.
