The Walnut Grove 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
Mostly sunny
Partly cloudy
Mostly cloudy
Partly cloudy
Showers likely
79° on Nov. 14, 1999, the hottest reading for this week of the year since 1961. Next is 75° in 2001.
Walnut Grove’s center stands about 1,210 ft above sea level. Within three miles the land runs from 1,140 ft to 1,320 ft, a difference of 180 ft: gently rolling country.
Under the town center the state geologic map shows Undifferentiated (conglomerate, sandstone, mudstone), from the Late Cretaceous, 72 to 100 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 41×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Conglomerate, sandstone, mudstone. Age: Late Cretaceous, 72 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.
A raindrop that lands in Walnut Grove reaches the Gulf of America by way of Plum Creek, the Cottonwood, the Minnesota and the Mississippi: about 2,060 river miles.
Lake on the way: Lake Pepin.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Walnut Grove; river miles along the main stem, rounded.
Walnut Grove has a warm-summer humid continental climate. Summer afternoons average 82° in July; winter nights fall to about 5° in January. A normal year brings about 46 inches of snow; with the rain, that comes to about 29 inches of water.
On November 14 Walnut Grove normally reaches 43° and falls to 24°. The record high is 79°, in 1999; the record low −3°, in 1986. The most rain on this date, 0.29 in, fell in 2024.
Normals 1991–2020 and records since 1961 at Lamberton Southwest Research And Outreach Center, 8 miles east. NOAA, through RCC-ACIS.
