The Mylo 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.
Mostly sunny
Mostly sunny; warmer
Partly cloudy
Mostly cloudy
Chance of showers
Mostly cloudy
Chance of showers
−20° on Nov. 11, 1986, the coldest reading for this week of the year since 1945. Next is −18° in 1959.
Mylo’s center stands about 1,650 ft above sea level. Within three miles the land runs from 1,600 ft to 1,710 ft, a difference of 110 ft: gently rolling country.
Under the town center the state geologic map shows Pierre Formation (shale), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 2 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 61×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Shale. Age: Late Cretaceous, 66 to 100 million years old. About 18 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 7 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.
Mylo has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about −5° in January. About 20 inches of rain fall in a normal year.
On November 14 Mylo normally reaches 36° and falls to 16°. The record high is 63°, in 1953; the record low −18°, in 1959. The most rain on this date, 0.12 in, fell in 1960.
Normals 1991–2020 and records since 1945 at Belcourt Keya Radio, 15 miles north-northwest, 310 ft higher. NOAA, through RCC-ACIS.
