The Martin 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.
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69° on Nov. 13, 2025, the hottest reading for this week of the year since 1942. Next is 68° in 1979.
Martin’s center stands about 1,630 ft above sea level. Within three miles the land runs from 1,580 ft to 1,700 ft, a difference of 120 ft: gently rolling country.
Under the town center the state geologic map shows Hell Creek Formation (sandstone, siltstone, claystone), from the Late Cretaceous, 66 to 100 million years old.
The section below crosses 4 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.
Sandstone, siltstone, claystone. Age: Late Cretaceous, 66 to 100 million years old. About 15 mi of the line.
Shale, sandstone. Age: Late Cretaceous, 66 to 100 million years old. About 8 mi of the line.
Shale, sandstone. Age: Paleocene, 56 to 66 million years old. About 0.9 mi of the line.
Shale. Age: Late Cretaceous, 66 to 100 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.
Martin has a warm-summer humid continental climate. Summer afternoons average 81° in July; winter nights fall to about −2° in January. About 19 inches of rain fall in a normal year.
On November 14 Martin normally reaches 36° and falls to 17°. The record high is 68°, in 2001; the record low −7°, in 1986. The most rain on this date, 0.45 in, fell in 1944.
Normals 1991–2020 and records since 1942 at Harvey 4 NE, 11 miles east. NOAA, through RCC-ACIS.
