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
Mostly cloudy
Partly cloudy
Showers likely
−10° on Nov. 15, 2014, the coldest reading for this week of the year since 1990. Next is −5° in 2005.
Eureka’s center stands about 1,130 ft above sea level. Within three miles the land runs from 950 ft to 1,320 ft, a difference of 370 ft: rolling country.
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 32×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Basalt. Age: Mesoproterozoic, 1 to 1.6 billion years old. About 10 mi of the line.
Sandstone. Age: Cambrian, 487 to 542 million years old. About 7 mi of the line.
Sandstone, siltstone, shale. Age: Middle Cambrian to Cambrian, 487 to 521 million years old. About 6 mi of the line.
Sandstone, siltstone, shale. Age: Cambrian, 487 to 497 million 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.
Eureka has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 0° in January. About 32 inches of rain fall in a normal year.
On November 14 Eureka normally reaches 41° and falls to 22°. The record high is 71°, in 1999; the record low −4°, in 1996. The most rain on this date, 0.30 in, fell in 2021.
Normals 1991–2020 and records since 1990 at Wild River State Park, 7 miles west, 290 ft lower. NOAA, through RCC-ACIS.
