The Grenora 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
Partly cloudy
Mostly cloudy
Chance of showers; cooler
Partly cloudy
Mostly cloudy
73° on Nov. 13, 1999, the hottest reading for this week of the year since 1937. Next is 66° in 1953.
Grenora’s center stands about 2,130 ft above sea level. Within three miles the land runs from 1,990 ft to 2,260 ft, a difference of 270 ft: rolling country. The highest named summit within 15 miles is Barr Butte, about 2,290 ft, 5 miles south-southeast.
Under the town center the state geologic map shows Bullion Creek Formation (claystone, siltstone), from the Paleocene, 56 to 66 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 43×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Claystone, siltstone. Age: Paleocene, 56 to 66 million years old. About 15 mi of the line.
Siltstone, claystone, sandstone. Age: Paleocene, 56 to 66 million years old. About 9 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.
Grenora has a warm-summer humid continental climate. Summer afternoons average 80° in July; winter nights fall to about −2° in January. About 15 inches of rain fall in a normal year.
On November 14 Grenora normally reaches 37° and falls to 15°. The record high is 62°, in 1939; the record low −16°, in 1940. The most rain on this date, 0.24 in, fell in 1964.
Normals 1991–2020 and records since 1937 at Westby, 18 miles north-northwest. NOAA, through RCC-ACIS.
