The Eureka 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
Partly cloudy
Partly cloudy
Partly cloudy
Chance of showers
73° on Nov. 15, 1953, the hottest reading for this week of the year since 1877. Next is 69° in 2005.
Eureka’s center stands about 1,890 ft above sea level. Within three miles the land runs from 1,810 ft to 1,940 ft, a difference of 130 ft: gently rolling country.
Under the town center the state geologic map shows Pierre Shale (shale, bentonite), from the Late Cretaceous, 66 to 100 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 59×. 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, bentonite. Age: Late Cretaceous, 66 to 100 million years old. About 24 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.
Eureka has a dry-winter warm-summer continental climate. Summer afternoons average 82° in July; winter nights fall to about 2° in January. A normal year brings about 44 inches of snow; with the rain, that comes to about 20 inches of water.
On November 14 Eureka normally reaches 39° and falls to 19°. The record high is 67°, in 1990; the record low −23°, in 1940. The most rain on this date, 1.12 in, fell in 2003.
Normals 1991–2020 and records since 1877 at Eureka, here. NOAA, through RCC-ACIS.
