The Johnstown 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.
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Mostly sunny; warmer
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Showers likely
−10° on Nov. 17, 1989, the coldest reading for this week of the year since 1931. Next is −9° in 1986.
Johnstown’s center stands about 1,300 ft above sea level. Within three miles the land runs from 1,140 ft to 1,350 ft, a difference of 210 ft: rolling country.
Under the town center the state geologic map shows Cambrian, undivided (sandstone), from the Cambrian, 487 to 542 million years old.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 56×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Sandstone. Age: Cambrian, 487 to 542 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 Johnstown reaches the Gulf of America by way of Rice Bed Creek, the Apple, the Saint Croix and the Mississippi: about 1,890 river miles.
Lakes on the way: Lake Pepin and Lake Mallalieu 175.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of Johnstown; river miles along the main stem, rounded.
Johnstown has a warm-summer humid continental climate. Summer afternoons average 79° in July; winter nights fall to about 0° in January. A normal year brings about 56 inches of snow; with the rain, that comes to about 34 inches of water.
On November 14 Johnstown normally reaches 39° and falls to 23°. The record high is 67°, in 1999; the record low −2°, in 1940. The most rain on this date, 0.57 in, fell in 1951.
Normals 1991–2020 and records since 1931 at Cumberland, 10 miles east. NOAA, through RCC-ACIS.
