The Halma 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
Mostly sunny; warmer
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Mostly cloudy
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Mostly cloudy
Chance of showers
−32° on Nov. 15, 1911, the coldest reading for this week of the year since 1899. Next is −19° in 1914.
Halma’s center stands about 1,000 ft above sea level. Within three miles the land runs from 970 ft to 1,030 ft, a difference of 60 ft: gently rolling country.
Under the town center the state geologic map shows Upper Ordovician (limestone, dolostone), from the Late Ordovician, 445 to 459 million years old.
The section below crosses 5 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.
Limestone, dolostone. Age: Late Ordovician, 445 to 459 million years old. About 13 mi of the line.
Granitic. Age: Neoarchean, 2.5 to 2.8 billion years old. About 6 mi of the line.
Shale, limestone, dolostone. Age: Jurassic, 145 to 202 million years old. About 2 mi of the line.
Conglomerate, sandstone, mudstone. Age: Late Cretaceous, 72 to 100 million years old. About 2 mi of the line.
Tonalite, granodiorite, diorite. Age: Neoarchean, 2.5 to 2.8 billion years old. About 1 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.
Halma has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about −4° in January. About 22 inches of rain fall in a normal year.
On November 14 Halma normally reaches 35° and falls to 19°. The record high is 65°, in 1953; the record low −19°, in 1919. The most rain on this date, 2.00 in, fell in 1944.
Normals 1991–2020 and records since 1899 at Hallock, 17 miles west-northwest, 180 ft lower. NOAA, through RCC-ACIS.
